C drive is full. What should I delete to clean up C drive safely?

Cleaning up a C drive can be a daunting task if C drive is full, but I'm here to guide you through it safely. Before we begin, let's emphasize the importance of being cautious: deleting the wrong files can indeed cause problems, so we'll take a step-by-step approach.

What to do if C drive is full：

1. Delete temporary files if C drive is full:
Press the Windows key + R to open the Run dialog box.
Type %temp% and press Enter to open the Temp folder.
Delete any files and subfolders in the Temp folder.

2. Delete Windows update files:
Open File Explorer and navigate to the Windows Update folder (C:\Windows\SoftwareDistribution\Download).
Delete any files in the Download folder.
Be cautious not to delete files in the SoftwareDistribution folder.

3. Delete old system folders:
Open File Explorer and navigate to the C drive.
Look for old system folders, such as System Volume Information, Windows.old, or other folders with old dates.
Be cautious not to delete folders containing essential files, such as Windows, Program Files, or Users.

4. Check the Disk Cleanup tool:
Press the Windows key + R to open the Run dialog box.
Type cleanmgr and press Enter to open the Disk Cleanup tool.
Follow the on-screen instructions to delete unnecessary files and system files.