Tech DC

Bootable CDs to the Rescue
Some viruses are so bad that they lock you out of your computer’s administrative controls. When that happens, consider using a bootable CD that can clean the hard drive of viruses. This often fixes things enough to let you get into Windows and make further repairs.

AVG Rescue CD
My favorite is the [...]

While Linux can be scary for most users, there is a simple way to get into it. It is the Live CD.
A Live CD is a CD that the computer loads or boots on. It does not modify your hard drive or computer in any way. So you can boot into Linux, another copy of [...]