WHy won't Rar work?

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ive downloaded so many rar hacks for warrock and non of them work it tells me i need to find a source from the web or a list and it brings me to a sight that says i need to download somthing but it costs money..... a lil help?!?!?!?

Download RAR at this site right here: http://rarlabs.com/download.htm

and dont worry about buying the trial i think i have had it for like a year it keeps telling me to buy but i dont and it still works

or an illegal download source maybe if your willing to risk it..........who said that??? :P