• Disk Cleanup is a Windows utility that deletes unnecessary files and will help speed up your computer and free disk space. Disk Cleanup can empty the Recycle Bin and remove unneeded system files, but most computer users have additional components that use disk space.
  
  

Temporary Internet Files

• Internet users can free space by deleting temporary Internet files. This folder is used by Internet browsers to store multimedia content, HTML and CSS files from visited websites. Temporary Internet files are stored on your computer so you can access faster websites that you go to frequently.
  
  

Recycle Bin

• Deleted files are moved to a temporary location called the Recycle Bin. This lets you restore an accidentally deleted file before it is permanently deleted. Items in the Recycle Bin occupy disk space and should be deleted regularly. Empty your Recycle Bin through Disk Cleanup or right-click the Recycle Bin icon on your desktop and click "Empty Recycle Bin."
  
  

Temporary Files

• Temporary files free the most disk space in Disk Cleanup. Temporary files are created while running a program. After exiting the program, temporary files are leftover files that are no longer used. Temporary files are unnecessary, but the files still occupy disk space on your computer. You can delete temporary files safely.
  
  

Windows Error Reporting

• Windows error reporting files generate when a computer error occurs. When Windows malfunctions, Microsoft collects information about your computer and generates a problem report. Microsoft uses this information to create solutions to your issue. After sending an error report, you can safely delete error reporting files from your computer.
  
  

Other Files

• You can delete all Disk Cleanup files without causing computer problems. Depending upon computer use, you may use more space with one Disk Cleanup component than another. Remove any other Disk Cleanup components that use a lot of disk space.