If you have nothing of value on the drive, you should be able to reformat the drive. You can get rid of the virus that way.
I once got a virus so bad that it even damaged the hard drive. It was a sleeper virus that lay dormant until sometime in December. Each time the computer was rebooted, another important system file was altered/destroyed.
When the tech people tried to reformat my hard drive, they found it would no longer allow 32 bits and would only configure at 16.