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Just clicked a link on steam message....

Most likely a key logger so, hopefully you got it removed and did a full scan with an updated virus software before it captured anything.
 
Give Hitman Pro a scan. Will find any rootkit/trojans/etc. It should be able to find any remnants of the file. They only work if you actually run the file. Since it was a download it wasn't a force injected file like some of the web based ones.
 
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