Clean disk C with the cleaning foundation that comes with the system.

1, right-click drive C-Properties.

Click Open, and then click Disk Cleanup.

3. Check the scan results, and then click Clear.

Second, clean up the startup items.

1, click Start-Run.

2. Enter MSConfig in operation, and then click OK.

3. Click Start to check antivirus and input methods, and click Start without checking others.

4. Restart the computer.

Third, use the third-party software 360 security guard plug-in function to clean up.

1, open 360 security guards.

2. Click More in the lower right corner.

3. Click Add Disk C to move and streamline the system disk.

Fourth, manual cleaning.

Open drive C, download and save the software, video and MP3 downloaded and saved in drive C..

, documents, etc. Go to another drive letter.