Okay I screwed up big time. My friend sent me a link saying it is a picture of a cyanide and happiness comic he really enjoyed. I opened the link and it downloaded an exe, my friend said to open the exe and I did and after freezing for a while it did nothing then EVERY single person on my facebook friends list got the same message from me so I know now this is a virus and I texted my friend about this and he had no idea and never sent me the message so the virus was originally from him. Now my CPU usage is constantly 100% on all four cores and can't play any games because of it and really need some help here. How do I fix this? Please help