I have seen getting to the enetering the Licese number and not going past that point, and that was using a System Restore disk that came with the Computer at the time. Took a call to Microsoft to fix that as I remember. Forgot what was done as it was a long time ago. I'm not even sure this will work seeing as how you can't get the machine Booted, but you can go to www.malwarebytes.org and install the free version on a Flash drive and try to run a scan with that if you suspect a virus, but as i said, not being booted, I don't know if it would even work.