have you just tried a regular repair off the disc?
Also exactly what is the problem?
This works sometimes if it's just corrupt files. SFC /SCANNOW Command - System File Checker
it requires you to be able to start windows though.
Your post it kind of confusing because it sounds as if you are able to boot.
If that is the case this should work Repair Install
I could give better info if I had more regarding the actual problem you are having.