Trouble with using a public PC

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I sat on this PC and before I can use it free from any eyes, I have lost much money for rental. have found this malware thecoolpics.net, searched the net for removal, and many people are having the same problem. It hijacked internet browser,registry,that I cannot chnage my homepage because it is disabled. When in Yahoo chat, it automatically sends link as and msgs as though you're the one who sent them to the other person youre chatting with, and I learned that when the clicked them, same happens to their PC. IS there anyone here who knows how to remove it? It's overly quite annoying.