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Speed Up Your Windows 7 Your computer may slow down due to temporary files and temporary internet files. Close all open applications. Click the  Start  button. In the  Search programs and files  box, enter  Disk Cleanup  and press  Enter .  Locate Disk Cleanup in the list and double-click to open. Wait for the window to open. Select  (check) these choices. Downloaded Program Files Temporary Internet Files Offline webpages Recycle Bin Temporary files Thumbnails Note : Setup Log Files and System error memory dump files should be left un-checked. Click  OK . Click  Delete Files . The window will close when done.  Source of this article