Computer infected with trojan, help?

Heyyy guys, in a bot of a dilly of a piccle I downloaded what i thought was a zipped folder of Media but it turned out to be an extremely bad software that disabled all my anti virus software, gave me a nice desktop background, and won't allow me to access add or remove programs, how do i get rid of this????? their are 5 new icons in my Drive wrqg, s, sofxlipg, oxhpb, jfjku PLZ HELP!!! _________________ [url=http://1downloadxbox360games.weebly.com]download xbox 360 games[/url]