Winrar problem

I just got a new old computer, and im trying to get it all set up. Now im having a problem with WinRar, when i try to install it, it says
":C/programfiles/Winrar"
Folder is not accessible

help plz.

Is this a typo?

Quote:

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":C/programfiles/Winrar"

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What OS are you using, in Vista? Try install as an administrator not with runas.