I was on my computer yesterday and a screen popped up saying I was infected. It was not from my anti virus so I clicked off. I run McAfee. Then everything started running slow. I ran my yahoo anti spy and founda gumbsumb J trojan. I deleted it but still everything is super slow. McAfee will not run. I defragged and no better. Tried to open in safe mode, it goes about 20 lines and freezes. Any suggestions???