Go to the “Organize” dropdown button, and select “Folder and Search Options.” Click the “View” tab. Check “Show hidden files, folders and drives,” and click Apply. Click “OK” to close the window., This defaults to C: unless manually changed to a different path letter. Go to Windows>Prefetch. Delete desired .pf files.
 As before, go to the “Organize” dropdown button, select “Folder and Search Options,” and click the “View” tab.

Open Windows Explorer.
Open your OS drive.
Open Windows Explorer again.
Select “Don't show hidden files, folders or drives.” Click “Apply.” Click “OK” to close.
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