Find your system recovery media and go back to factory conditions would certainly help.
Using startup repair from a regular Vista install DVD might help also. If it doesn't it might be time for a clean install using this same DVD.
You'll lose what you didn't backup, unless you install of a new disk or copy your files first to another hard disk using some other PC or OS.
Kees
The pop up "Microsoft Windows" logo is on the scanner program and told us we were infected and when we ignored the pay now to fix option another pop up repeatedly said to close down computer ands restart to fix errors. It was so bad we just powered off comp and now....vista won't boot. What can we do for free first? And What program can I install and Run from the command line if I need to buy one? (from win rec/vista rec) as it's my only access.,

Chowhound
Comic Vine
GameFAQs
GameSpot
Giant Bomb
TechRepublic