XoloX isn't responsible for your own ignorance in downloading files, not to mention I won't even begin to ask what you thought cracker.exe was supposed to be. If your computer is infected with virii, or you think it may be, housecall is a reasonably effective scanner for free - this can be found at
http://housecall.antivirus.com

I would recommend you purchase decent anti-virus software anyways, since it's something that you generally will run into at some time.. I myself prefer Norton, although others such as PC-Cillin are popular and effective.