I only know this because I did something like this yesterday.

I have a partition recovery disk that restarts windows. I saw there was also a feature to repair Windows too, and I think thats what you are looking for. Basically, you have to go into the BIOS and set the boot order to be CD-ROM first if it already isn't. Then put in the CD-ROM and restart. It will read from the CD instead of your hard drive. Then it will start Windows recovery. From here you have a DOS menu and you can choose from there whether to do a repair, or a clean install.

I hope this is the right disk you are talking about. Hope it works out for you.