I am 100% sure that it is clean! I had the same problem once. I got a virus when I accidentally clicked on an advertisement. Scrolled me down at the last second, probably meant for you to click it, and every time I tried to open a program, it would tell me it's dangerous and not let you open it, then it would only let you open the virus itself. (Since it downloaded something onto it) Luckily it is fixed. =D