Your downloaded rar and zip don't work....
You know how to handle those files properly ? first unpack read all the text and nfo files and then install.
It could be bogus files you had so far, I don't know if they exist for games but they sure do for music and video.
To avoid bogus files make sure you download a file with a reasonable size.

About .exe files,
Not all of them are infected and actually it's the same for zip and rar .

So it's important to have a good and updated virusscanner if your into game downloading.
If you have doubts about the one you have I can reccomend AVAST it's free and good



If you want to be more specific on what you downloaded do it in a PM to me.

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Het algemeen gnutella forum in Nederlands