hp support message says windows.old is taking up a lot of space on my hard drive and I should remove it. How can I do this safely I have located the file and to delete anything there I get a message that I must have permission from "trusted installer" . Now I'm really confused. My pc is slow and hangs up, freezes up occassionally. I hve disks for re-install, but don't really know if that is the solution.
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