I have downloaded the CM4 from gamecopyworld. Now what do I do with it? It is in .rar format. I am utterly clueless as to what to do. please help me!!!!!!!

Goto download.com and download winrar, this is basically the same as winzip, unrar the file to your desktop, then copy the patch to your cm4 directory. It will ask you if you want to replace cm4.exe for the patch, click yes, and away you go.