Like RebateMonger stated, reformatting is the best option. I used to download viruses to virtual machines and ran into this error before and it was never fixed after days of work and searching for something using many different programs/pre-environments.
Backup what you can and reinstall is my best suggestion as well. In fact, starting over is actually a good thing since it will make your system faster and get rid of the 'leftovers' that build up on systems.
Backup what you can and reinstall is my best suggestion as well. In fact, starting over is actually a good thing since it will make your system faster and get rid of the 'leftovers' that build up on systems.