My PC was freezing every time I try to open a folder, and I had to turn off by the power button.

I try to use system recover, and now when I try to start the PC, its starts normal, but after the screen were the windows are loading, it becomes a black screen, and the system recover does not come up, and the windows don't load.

I tough I need to wait a while for the system recover to show up, but I wait 15+ hours and nothing.

I try to boot with windows XP cd, but as soon as I chose for repair, I got asked for a administrator password, and I have no idea what is the password. I never use password to log in.

Could anybody help?