I have the same problem.

When I start up my computer it reads "loading PBR for descriptor 2: done Bad PBR"

I've tried using the windows installation cd but when it takes me to the setup/"press R to repair" page, and I press R it says "setup did not find any hard disk drives installed in your computer." My only option then is to press F3 and go back to the "loading PBR, " page.

If you have any suggestions I would really appreciate it. I'm not good with computers and even DELL support has been shrugging their shoulders at me.