The fact that it wont reboot, tends to lean me in the direction that you have something else going on aside/besides a virus. A virus that would not let your computer re-boot, would not be a very good virus. Proliferation and infection are what a virus is all about, and its a little hard to spread and accomplish any bad deeds on the host when you cannot even boot the machine.
That is not to say that you don't have a virus, which could be a very distinct possibility with what you have said of your browsing habits. But unless you have the ability to pull the drive as suggested earlier, then the only way forward is to get the machine to boot.
So start by telling us exactly what you mean by not booting? At what point does it stop? What is displaying on your screen? Messages? The more information you provide, the better you can be assisted.