how to kill a virus?

unless we know how it is spread it is unknown

nod32 is good for THREATSENSE not for deleting virus from pc, nod is good for stopping not for deleting, download avira personal antivirus maybe it will delete the bad virus from you computer, good luck. Or If Its too late just reinstall windows and next time make partitions on your hard disk so you can keep the important files

I think if your com is infected with this kind of virus, most probably it cant be saved. Anyway, what high level virues are u refering to? The usual high lvl ones are those which wipe out yr entire drive. You can try re-formating your com.

Well, it's quite difficult, and depending on which virus you've got. If you have a virus which has infected 1000s of your files, you can't do much about it, accept repairing you're computer with the system CD, or format all your hard disk, and re-install Windows. It's very important to make back-ups of your system, cos' it's the easiest way to repair all your files, without making big problems. And as last I would like to recommend you to start using ESET NOD32 Antivirus software. It's the best nowadays on the market.