I'm sorry, mrkam, but I haven't any experience of using such a disk, only read about the process and results, mainly on this forum (you could try a forum search for more info, maybe).
What I've read leads me to think that this might be the best chance of fixing your problem. (Wouldn't hurt to back up your files first, if you can.)
I've read that DrWeb has a good reputation at being able to heal infected files. I'd probably go with that one, but frankly, any of them are likely to be able to fix your system up, if it's fixable.
You need to make sure your computer can boot from a CD. This can be checked in the BIOS settings, but I think that's pretty standard.