Ultimate Boot CD

Mywindows xp home, on a eMachines desktop, crashed while doing a registry rollback. It corrupted the registry so the computer will not boot.

1. I made a ubcd on my laptop and it boots up the desktop. However, I cannot find any way for it to read my c: drive. I need some way to replace the corrupted registry with a good one. How can I do it? I don't know if the hard drive shipped ntfs or fat?

This seems like such a simple problem. I tried the windows repair console but it would not load because it couldn't find the Microsoft license.

I am also worried about Windows fixing the problem and writing over all of my data which would be a disaster, which is why I am fearful of running the restore cd which came with the computer.

Any advice would be very helpful.
thanks,

Hmm if your drive doesn't seem to be recognized it's probably NTFS.
Then you should load NTFS4DOS (or a similar named program) that must be included somewhere.
Once it's done, you may try to do a scanreg /fix or scanreg /restore, if only that command still exists in Windows XP ...