I am using another computer to post this message, not the one that is infected. The infected computer is a Gateway Laptop with Vista Home Premium 64 bit. Ok. So the other day, something popped up on my screen and started to "scan" my computer for viruses. It was call "Action Antivirus". It was popping up porn sites and wouldn't let me use any programs. I ran the computer in safe mode with networking and ran malwarebytes and thought i got rid of the problem. This morning, my computer shuts off by itself. I turn it back on and now its doing basically the same thing (-the porn sites) and its something called "System Tool Warning" and keeps scanning and won't let me access any programs or anything and it says they are all infected. So, i restarted in safe mode with networking and ran malwarebytes. It said that it found one infected item and i removed it and thought that was the end of that. When i restarted in normal mode... "System Tool Warning" was still bringing on its evil. So I again restarted in Safe mode with networking and ran malwarebytes again and it found nothing. I tried to scan with Microsoft Security Essentials and everytime I do that, the computer just shuts off. I tried to post this using the infected computer in safe mode but halfway through the post, the computer shut off. I don't understand why malwarebytes isn't finding anything and the problem isn't going away! Please help me! I don't have the money to take this thing in.