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How to Run Disk Cleanup on a Windows 7 Computer

The Disk Cleanup utility removes unnecessary files to free up space on the disk drive of your choice. To run Disk Cleanup on a Windows 7 computer, follow these steps:

  1. Click Start.
  2. Click All Programs Accessories | System Tools | Disk Cleanup.
  3. Select Drive C from the drop-down menu.
  4. Click OK.
  5. Disk cleanup will calculate the free space on your computer, which may take a few minutes.
  6. After the calculation is complete, you should see a dialog box that looks similar to the following:
  1. Confirm that only the following checkboxes are checked:
  • Downloaded Program Files
  • Temporary Internet Files
  • Recycle Bin
  • Temporary Files
  1. Click OK.
  2. You will see a dialog box that prompts you: Are you sure you want to permanently delete these files?
  3. Click Delete Files.
  4. Disk cleanup will delete the files and close automatically.

Credit : http://www1.udel.edu/topics_css/windows7/diskcleanup-windows7.html