1. Use the cleaning tools provided with the system.

Method: Right-click drive C- Properties-Disk Cleanup.

2. Manually clean up the startup project.

Method:

1) Click Start-Run-Enter MSConfig.

2) Click OK, and then click Start, except antivirus and input method.

3) Restart the computer after confirmation.

3, with the help of third-party software, 360 security guards.

Method:

1) Open 360 security guards.

2) Run the functions of killing and repairing, computer cleaning, optimization and acceleration respectively.

3) Click More.

4) Find the system disk to slim down and move the C disk to run.

Win7 update, can be closed.

Method:

1. Open win7 Start Menu-Control Panel, and then find "System and Security". In the System and Security tab, select windows update”- enable or disable automatic updates.

2. After clicking Change Settings, in the Settings dialog box, select Never check for updates for important updates and confirm.