If files, settings, or desktop changes disappear after a restart, Deep Freeze is one possible cause—not a Windows diagnosis. Faronics Deep Freeze deliberately restores protected drives to a baseline when they are Frozen, but a temporary Windows profile, a managed-PC policy, failed writes, malware, or a failing drive can look similar. First protect important files, then distinguish changes reverting from Windows actually freezing or crashing.
First identify what is happening
| What you notice | What it may indicate |
|---|---|
| New files or settings vanish after reboot; deleted files return | Deep Freeze or another restore policy, a temporary profile, or failed writes |
| Only one account loses its desktop or settings | A temporary or damaged user profile is more likely |
| The screen remains visible but Windows stops responding | A freeze involving a driver, application, hardware, storage, or Windows |
| A blue screen appears, perhaps with different stop codes | A crash; drivers, hardware, storage, or Windows may be involved |
| Quarantined malware or removed items reappear | A restore mechanism, security-software problem, permissions issue, or possible malware; this alone does not prove infection |
Deep Freeze symptoms are not a formal Windows error. A Frozen Deep Freeze drive discards changes made to that protected drive at restart. The PC can otherwise run normally during the session. A temporary profile instead affects the signed-in user’s files and settings, while a genuine freeze or blue-screen crash is a separate problem. See BCIT’s explanation of Deep Freeze on managed computers.
Protect files before troubleshooting
- Stop saving important work to the affected Desktop or Documents folder until you know whether that location persists.
- Copy essential files to an external drive or an approved cloud or network location. If storage may be failing, minimize use and avoid repeated restarts; consider professional recovery before repair attempts.
- If files seem missing, check
C:Users<username>,C:UsersTEMP, other profile folders underC:Users, and any OneDrive or organization backup location. - Do not assume that
D:, a USB drive, or a network folder is persistent or protected appropriately. Confirm the policy with the PC’s administrator. - Do not reset Windows, reinstall it, delete profiles, or run invasive repairs before backing up data that matters.
If Deep Freeze is active, a file saved to a protected Frozen drive can be discarded at the next restart. Faronics documents configured persistent storage called ThawSpace, but its drive letter and setup depend on the administrator’s configuration. See Faronics documentation on protected drives and ThawSpace.
Check whether Deep Freeze is actually installed
- Look for the Deep Freeze bear icon in the notification area, including hidden tray icons.
- Press Ctrl + Alt + Shift + F6. On some installations this opens the Deep Freeze control dialog; an administrator can disable or change the shortcut, so no response does not rule it out.
- Open Settings > Apps > Apps & features, or Control Panel > Programs and Features, and look for Faronics Deep Freeze.
- Check Windows Services and installed/startup applications for Faronics or Deep Freeze components. Do not stop services or remove files as a test.
- If this is a school, work, library, hotel, kiosk, or other managed PC, ask its administrator whether it uses Deep Freeze, Windows Unified Write Filter, or another restore policy.
A community Microsoft Q&A mentions both Deep Freeze and temporary profiles as possible explanations for changes not being saved, so the symptom alone cannot confirm the software: Microsoft Q&A on changes lost after restart. Do not try to bypass a management password or remove protection without authorization.
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If Deep Freeze is confirmed
Frozen, Thawed, and ThawSpace
- Frozen: writes to a protected drive are reverted when the computer restarts.
- Thawed: authorized changes to the drive can persist through restart.
- ThawSpace: a designated storage area intended to retain files while the operating-system drive remains Frozen; exact configuration varies.
Faronics documents administrator controls to reboot in Frozen or Thawed states and, in its Cloud workflow, to schedule a specified number of Thawed restarts (up to 99). That figure is specific to the documented workflow, not a universal setting for every Deep Freeze product. See Faronics reboot-state documentation.
Make authorized changes safely
- Ask the Deep Freeze administrator to schedule maintenance or authorize a Thawed period.
- Use the management interface’s Reboot Thawed action, or its equivalent.
- While Thawed, apply approved Windows, driver, application, or security updates.
- Restart and verify that changes persist; then have the administrator return the workstation to Frozen mode.
- Save user files only to the organization’s approved persistent location.
Faronics documents scheduled Thawed maintenance and Windows Update workflows for managed installations. An update that downloads while Frozen is not necessarily permanently applied; the system may need to reboot Thawed for installation. This is not evidence that every failed Windows update is caused by Deep Freeze. See Faronics Windows Update and Thawed Period documentation and Faronics update caching and ThawSpace documentation.
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Do not manually delete Deep Freeze files, rename drivers, alter the registry to evade protection, or use password-removal tools. Those actions can damage startup or undermine recovery. Deep Freeze is also distinct from System Restore, which returns selected system state to a restore point. Windows Enterprise PCs may use Microsoft Unified Write Filter or another kiosk policy instead; similar behavior does not establish which product is in use.
If Deep Freeze is not confirmed
Check for a temporary profile
Windows can sign in with a temporary profile when it cannot load the usual one. The desktop may look familiar, but changes made in that temporary profile may disappear; the original profile folder can still be present.
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- Open Command Prompt and run
whoamiandecho %USERPROFILE%to identify the signed-in account and profile path. - Compare the reported path with the expected folder under
C:Users. Check for the original profile and aTEMPfolder. - Back up files before changing profiles or the registry. If the original profile is damaged, an authorized administrator can create a new local administrator account and copy verified personal files into it.
- Keep the old profile until personal files and needed application data have been checked in the new account.
Some community advice suggests restarting several times, but this is not a guaranteed Microsoft fix. Verify which profile is loaded and preserve the original data before relying on repeated restarts. See Microsoft Q&A on files and settings reverting after restart.
Test whether a write is being retained
If the computer is stable and data is backed up, create a harmless test file in Documents, note its full path, and restart once. Check that exact path afterward. If only one account is affected, test with a newly created account only if you have authorization. On managed devices, consult IT before changing accounts or policies.
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Consider updates, security software, and storage
- If Windows updates seem to install and then disappear, check for restore software or a managed update policy before repeating the update.
- If a security tool’s quarantine entries return, review its logs and the Windows event logs. A restore mechanism may restore the earlier state, but malware or a damaged security installation is also possible; the symptom does not establish infection.
- If there are disk errors, SMART warnings, unusual drive noises, repeated profile corruption, or multiple stop errors, prioritize backup or imaging and qualified help over reset or reinstall attempts.
- A Windows policy or kiosk configuration can also discard changes without Faronics Deep Freeze. Ask the device owner or administrator to identify the policy.
If active malware is suspected, disconnect from the internet where practical, preserve personal files without copying unknown executables, and use a reputable offline or Safe Mode scan. On a Deep Freeze-managed PC, updates to security software may require an authorized Thawed maintenance window. If system integrity cannot be established, a clean reinstall after backup may be safer than repeated cleanup attempts.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.If Windows itself freezes or shows a blue screen
These steps address an unresponsive or crashing PC, not simply changes that revert after reboot. Microsoft recommends recording what was happening, how often the freeze occurs, and whether it affects one or multiple computers. See Microsoft’s Windows freeze troubleshooting guidance.
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For an unresponsive screen
- Press Ctrl + Alt + Delete. If the security screen opens, start Task Manager and inspect CPU, memory, disk use, and unusual processes.
- If the display is blank or stuck, press Win + Ctrl + Shift + B to reset the graphics driver. A beep or screen flicker may occur. See Microsoft blank-screen troubleshooting.
- If the machine remains unusable, holding the power button for about 10 seconds forces shutdown, but unsaved work can be lost and interrupted writes can cause damage.
- After a successful boot, review Event Viewer > Windows Logs > System and Application around the incident. Open it with
eventvwr.msc. - To generate a System Diagnostics report, run
perfmon /report. Microsoft includes this among freeze investigation tools.
For blue screens or repeated restarts
- Photograph each stop code and any “What failed” driver name; changing codes do not prove Deep Freeze is involved.
- Disconnect recently added hardware and boot into Safe Mode if Windows can start.
- Check Device Manager for warning icons; update or roll back a driver changed shortly before the crashes.
- Check free disk space and review
C:WindowsMinidumpfor crash dumps. - Use Windows Memory Diagnostic or a reputable bootable memory test, and the drive manufacturer’s diagnostic utility if storage trouble is suspected.
- Consider System Restore or Windows recovery if the issue began after a driver, update, or installation. Back up first and avoid a reset when the disk may be failing.
Microsoft’s blue-screen guidance covers Safe Mode, Device Manager, free-space checks, updates, and recovery: Troubleshoot blue-screen errors. Microsoft’s stop-code article reports that third-party driver code accounted for most of the stop errors in its analyzed set, with smaller shares attributed to hardware, Microsoft code, and unknown causes; this is not a probability for an individual PC. See Microsoft stop-code troubleshooting.
Repair options, from least to most disruptive
- Back up or image important data. If the drive may be failing or files are irreplaceable, consult a recovery professional before repair operations.
- Resolve the profile or management issue. Confirm the active profile and ask the device administrator whether a restore policy is enabled.
- Repair Windows system files. If storage is healthy, the issue is not simply Frozen-drive rollback, and you can use an elevated Command Prompt, run
DISM /Online /Cleanup-Image /RestoreHealth, thensfc /scannow. These can repair Windows components and protected system files; they do not turn off Deep Freeze and their changes may not persist on a Frozen drive. - Check the file system. After backing up, run
chkdsk C: /scan. Some repairs require offline access and may be scheduled for restart; do not interrupt a repair in progress. - Roll back a recent driver or update, or use System Restore if the timing points to a recent change and the recovery option is available.
- Use Windows Recovery Environment or reset Windows only after backup and after ruling out a managed restore policy. A reset may not fix a failing drive or a policy that restores the machine.
- Clean-install Windows or replace hardware when system integrity cannot be trusted or diagnostics indicate a failing component. Keep recovery keys and installation requirements available, especially on encrypted or managed devices.
When to get administrator or professional help
- The computer is managed by a school, employer, library, hotel, or kiosk operator; only its administrator should change Frozen/Thawed state or policies.
- The drive reports errors, makes unusual noises, or contains irreplaceable files and the PC no longer boots reliably.
- Crashes continue across Safe Mode or after removing recently added hardware, or memory/storage diagnostics report errors.
- Malware may have compromised the system, or you cannot determine whether files are safe to copy.
- The drive is encrypted and you lack the recovery key, or a proposed reset/reinstall could erase data.
If Deep Freeze is present, its behavior is deliberate restoration of protected-drive state; if it is not, investigate the profile, policy, Windows, driver, security, and hardware paths separately. Do not treat “Deep Freeze symptoms” as proof of a particular cause.
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