Once you get your computer sterilized and updated you should create an entire restore of your computer and burn it to dvd. This way you will be able to recover faster and easier than what you are faced with now.
In your control panel / system and maintenance is where you will find the windows backup an restore
Windows Complete PC Backup
When you first set up your computer, you should create a Windows Complete PC Backup image, which is like taking a snapshot of the programs, system settings, and files on your computer. You can use this backup if your computer ever stops working. Although this type of backup includes your personal files, we recommend that you back up your files regularly using the Back Up Files wizard. You should also update the Windows Complete PC Backup image every six months. Windows Complete PC Backup and Restore is included with Windows Vista Business, Windows Vista Enterprise, and Windows Vista Ultimate.