If Windows became slow or unstable after using MemoryCleaner, first stop any automatic cleanup and check which version you have. Resetting MemoryCleaner’s preferences may help if the issue is a changed setting, but it is not documented as reversing a cleanup that has already run. If Windows itself is malfunctioning, Microsoft System Restore may roll system files, registry settings, and installed programs back to a restore point.
First, distinguish app settings from Windows recovery
MemoryCleaner’s restore-defaults control resets the utility’s preferences; it is separate from Windows System Restore. The developer’s Korean version-history page lists a button to restore all preferences to defaults in MemoryCleaner 3.0.0, dated September 29, 2026. The English-language page lists version 2.0.3, dated September 3, 2026, and does not show that later release. Check your installed version and the developer’s current page in the relevant language before looking for the control: it may not be present in every build. MemoryCleaner version history (Korean); MemoryCleaner version history (English).
- Open MemoryCleaner and note its version. If automatic cleaning is enabled, stop or disable it so it does not continue while you troubleshoot.
- If the problem appears limited to MemoryCleaner preferences and your build has the control, use its restore-all-settings-to-defaults button.
- If Windows remains slow, crashes, freezes, or behaves unexpectedly, use Windows recovery guidance rather than assuming the settings reset repaired the PC.
The developer documents manual and automatic memory cleaning, including working sets and standby memory on its English page. The official pages do not explain how to reverse an individual completed cleanup, and they do not establish that MemoryCleaner caused a particular PC problem.
Use System Restore if Windows still starts
System Restore can return system files, registry settings, and installed programs to the state captured at a selected restore point. In Windows, open Control Panel > Recovery > Open System Restore, or run rstrui.exe. Choose a restore point from before the problem began. If offered, scan for affected programs to see which apps or drivers may be changed, then follow the prompts and let the PC restart. Microsoft’s instructions are at System Restore.
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A restore point is useful only if a suitable one is available. System Restore does not affect personal files, according to Microsoft, but apps, drivers, updates, and settings added after the selected point may be removed or changed. It is not a full backup and does not promise to recover RAM contents or undo a specific memory-cleanup operation.
If Windows will not start, use Windows Recovery Environment
If the PC will not start normally or is stuck in a restart loop, enter Windows Recovery Environment (WinRE). From its recovery menus, select Troubleshoot > Advanced options > System Restore, choose an appropriate restore point, and proceed through the prompts. Microsoft notes that an encrypted device may require its BitLocker recovery key. If the PC is managed by work or school and recovery options do not resolve the problem, contact the organization’s IT department. See Microsoft’s recovery options in Windows.
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When to consider a reset or reinstall
Reset this PC or reinstalling Windows is more disruptive than System Restore and should not be the first response to a mildly slow PC. Windows recovery choices differ in whether they keep or remove personal files; read the current on-screen prompts carefully and back up important files first whenever possible. Microsoft warns that some recovery options can result in data loss. Its recovery options guide explains the available paths.
A USB recovery drive is another option when other routes are unavailable or the PC cannot boot. It contains Windows recovery tools, not personal files, so it is not a substitute for a separate file backup and is not required to run System Restore from a working Windows installation. Follow Microsoft’s backup, restore, and recovery guidance to create or use recovery media.
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What to expect from MemoryCleaner 3.0.0
The developer’s Korean version-history page lists MemoryCleaner 3.0.0, dated September 29, 2026, with a control to restore all preferences to defaults. It also says that release was rewritten in C and claims the executable size was reduced by about 98%; that is a developer claim about file size, not evidence of improved Windows performance or recovery. Because the English page reviewed lists an earlier version, verify the installed build and available controls rather than assuming every copy includes the defaults button.
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