Trojans

Help anyone! Last night I got hit with a Trojan named System Tool. It is very nasty! Scotty from here gave me some help sending me Malwarebytes Mbam. However, apparently didn't work as my machine is still messed up. I'm running McAfee AV now, but am not hopeful given some of the forums I've tried. Any advice?

pAnIcK!
Grover