The first checklist item is running Disk Cleanup on a monthly basis. Disk Cleanup helps to keep a computer running fast by removing temporary Internet and Windows files, removing downloaded program files, emptying the Recycle Bin, and other optional files that are not needed on the computer.
There are a few ways to run disk cleanup on your computer. The first is by opening My Computer or Computer depending on the Windows version you are using. Right click the primary disk drive - usually Local Disk (C:) - and selecting Properties. on the General tab, click the Disk Cleanup button.