[Edited by PWizard, 7/26/2014 2:15:57 PM]
The other thing to try would be to reinstall your winrar or whatever program you are using to unpack these files.
Given that you are having problems with other rar files and others aren't, it's almost certainly a problem with your computer. Either Anti-Virus or unzipping/unraring program.
If you want a recommendation on anti-virus to use, I have noproblems using Norton.
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on trainer and game.
version and distribution.