Okay, first off, I am a NewB, but hey any help is help, right?
Anyway, the only thought that came to mind when I read about your issue is, can you reach a command line interface where you can enter linux commands? If you can, then you may be able to manually repair the problem.
I *HIGHLY* doubt that it has anything to do with the Blaster virus because Blaster affects the RPC overflow in a Windows system that hasn't been updated. It should not have any effect on a Linux system because the networking works totally differently (as you very likely know, I know ... I just like to see myself type).
One other thought I had was .... maybe boot up using a Mandrake (or other distro) live CD. You know, like MandrakeMove. That would give you access to the computer with a fully functional interface that you could mount the drives with and browse the system.