Hello matrunner,
I am afraid that i have some bad news for you.
If your computer is infected with this variant of virus
Win32.Virut.q , there is not much that can be done.
This will infect all .exe files on your system, it is a polymorphic file infecting virus, which means that it changes constantly and makes it difficult to detect and clean, because it's code is constantly changing.
There is yet no cure for this variant of virut because of too much corruption it does to files.
Do not run avast boot time scan yet, it is possible that after running it the computer not to be able to boot. Also do not run online scanners like Bitdefender and others that includes cleaning, because we already tested couple of online scanners and they deleted all system files that were infected. You can run Kaspersky online scan because it doesn't offer cleaning service and we can confirm that way if you have this variant of virus.
I suggest that you make a back up on CD, any important documents you might need, you can also back up your music and picture files, but
don't back up any exe files or screensavers.
I am afraid that clean reformat is the only choice here. You will need to have recovery cd or back up image of the system. After reformatting, use avast to scan your back up CD, also online scanner to confirm that the back up you have is clean of this virus.
Let us know if you need help with this.
Regards