Okay, 'we don't get viruses' but a program called Performance Optimizer has just downloaded itself to my downloads folder. I was visiting MySpace and it minimized Safari and gave me an offer box, kinda like a pop-up but it managed to make my Safari window a 1" square on my desktop. I hit no thanks and it maximized Safari then 30 sec later my downloads pop up came and now it's in my downloads folder. It's an .exe file which ?? can't even work on a Mac right? I haven't noticed any program that I have installed on my Mac in an .exe format. But what do you guys think my next step is? My google search isn't telling me if it's a PC only maleware/virus.