Complete Guide to Cleaning Windows 11: Free Up Disk Space and Improve Speed

Introduction / Why This Is Needed

Over time, Windows 11 accumulates a large number of temporary files, cache, unnecessary installed programs, and other data that takes up disk space and slows down the system. Regular cleanup helps:

• Free up space on the system drive (usually C:\), which is especially important for SSDs with limited capacity.
• Improve system responsiveness, as there is less fragmentation and disk load.
• Remove unnecessary background processes that may run silently.

In this guide, you will learn how to safely and effectively perform a complete cleanup of Windows 11 using built-in tools, without the risk of deleting critical data.

Requirements / Preparation

Before you begin, ensure that:

1. You are logged in with administrator privileges.
2. There is enough free space on the system drive (C:\) to perform the operations (at least 1-2 GB).
3. It is recommended to create a system restore point (this will be the first step in the instructions).
4. An internet connection is required for some features (e.g., to download updates or third-party utilities, but this guide uses only built-in tools).

Step 1: Create a Restore Point

Create a restore point so you can revert the system to a working state in case of an error.

1. Open Control Panel (press Win + R, type control, and press Enter).
2. Go to System and Security → System → System Protection.
3. On the System Protection tab, select the C: drive (system) and click Create.
4. Enter a description, such as Windows 11 Cleanup, and click Create.

Or use PowerShell as an administrator:

Checkpoint-Computer -Description "Windows 11 Cleanup"

⚠️ Important: Do not skip this step, especially if you are performing a deep cleanup for the first time.

Step 2: Clean Temporary Files via Windows Settings

Windows 11 provides a convenient interface for removing temporary files, Store cache, and other unnecessary data.

1. Press Win + I to open Windows Settings.
2. Go to System → Storage.
3. The system will automatically analyze disk usage. Click on Temporary files.
4. In the window that appears, select the categories to delete:
   • Temporary files (main category)
   • Browser cache (if needed)
   • Microsoft Store cache
   • Previous Windows installations
5. Click Delete files and confirm the action.

💡 Tip: If you see an item labeled "Files that can be deleted to free up space", be sure to review it—it may contain large files like old Windows updates.

Step 3: Use the "Disk Cleanup" Utility (cleanmgr)

The classic cleanmgr (Disk Cleanup) utility allows you to delete system files that are not visible in the storage settings.

1. Press Win + R, type cleanmgr, and press Enter.
2. If prompted to choose a drive, select the system drive (C:).
3. In the Disk Cleanup window, click "Clean up system files" (requires administrator privileges). This will add additional options.
4. Uncheck any files you want to keep (e.g., "Downloads" or "Documents" if they contain important data). Recommended for deletion:
   • Temporary files
   • Windows Update Cleanup
   • Temporary Internet Files
   • Recycle Bin
   • Previous Windows installations
5. Click OK and confirm the deletion.

Step 4: Remove Unnecessary Applications

Many pre-installed and manually installed programs take up space and can run in the background.

1. Open Windows Settings (Win + I).
2. Go to Apps → Installed apps.
3. Sort the list by size (click the "Size" column header) to find the largest ones.
4. For each application you do not use:
   • Click the three dots on the right and select Uninstall.
   • Follow the uninstall wizard instructions.
5. Pay special attention to:
   • Pre-installed apps from your PC manufacturer (e.g., trial antiviruses, utilities).
   • Old games and programs you haven't launched in over a year.

⚠️ Important: Do not uninstall Microsoft apps (e.g., "Windows Store Client") and system components if you are unsure of their purpose.

Step 5: Configure "Storage Sense"

Enable automatic cleanup so Windows can delete temporary files on a schedule.

1. In Windows Settings, go to System → Storage.
2. Toggle the "Storage Sense" switch to on.
3. Click "Configure Storage Sense" or "Storage Sense".
4. Configure the settings:
   • "Run Storage Sense" — select a frequency (e.g., "Monthly").
   • "Delete temporary files that my apps aren't using" — enable.
   • "Empty the Recycle Bin" — set a retention period (e.g., "After 30 days").
   • "Delete files in the Downloads folder" — use with caution; only if you are sure nothing important is there.
5. Click "Clean now" to run it immediately if needed.

Step 6: Additional Cleanup (Optional)

If disk space is still low after the previous steps, consider:

• Cleaning the C:\Windows\Temp folder: Open File Explorer, navigate to this path, and delete all files (some may be locked—skip those).
• Clearing browser cache: Go into your browser's settings (Chrome, Edge, Firefox) and delete history, cache, and cookies.
• Deleting old restore points: In "System Protection" (see Step 1), click "Delete" to remove old points, keeping only the most recent.

Verify the Result

After completing all steps, verify that space has been freed:

1. Open File Explorer, right-click on the C: drive → Properties. Check the "Free space" value.
2. Or go back to Settings → System → Storage and review the usage chart.
3. If you uninstalled many programs, restart your computer—this will free up memory occupied by temporary files from the removed programs.

Potential Issues

Problem: Insufficient permissions to delete certain files

Solution: Run Disk Cleanup (cleanmgr) and File Explorer as an administrator. Right-click the program and select "Run as administrator".

Problem: "File in use by another program" error when deleting

Solution: Close all open programs, especially browsers and office applications. If that doesn't work, restart your computer and try again.

Problem: System runs slower or shows errors after cleanup

Solution: Restore the system from the created restore point (Control Panel → Recovery). In the future, be careful when deleting system files—always leave checkboxes you don't understand.

Problem: Not enough space to complete the operation

Solution: Temporarily move large personal files (videos, archives) to an external drive or cloud to free up at least 2-3 GB on the system drive. You can move the files back after the cleanup.