Computer is infected by a virus or a malware, what do I do now?
He is running Windows 7. At startup, the computer shows a video on the screen (full screen, I think). After a while, the screen becomes black. I'm not sure if it is a virus or not, but he got it when he played a video online. He rebooted his computer, and this happened. He hasn't installed an antivirus programme yet. Is there any solution? Can it be fixed?