Clearly if the site is hosting the "You've got a bazillion viruses" trojan ad something's wrong with the site.
My brother (a realtive computer novice) clicked on that ad one day. After two days on the phone I just had him do a clean re-install which meant two more days on the phone. Of course you always could give them money for their "service" and they'll put the trojan to sleep for you.
BTW, don't click the x to close the ad. It's part of the active interface. You need to use task manager to close it.
File sharing sites are, for the most part, fine or they wouldn't be in business. It seems this one is not despite pervert's "assurances".