HP desktop keyboard quit working. need help!!

Hello,
I have a HP Media Center 2005 desktop computer. Yesterday it was working fine, today I turned on my computer and I can't get into it because I have a password set up on my Windows and I can't type. I've tried three different keyboards, none of which work, including a wireless. We can get into safe mode, but can't access anything from there and still can't type. I have papers on there I need to turn in tomorrow! Can anyone help me? We're copying the hard drive but I still want to be able to use my computer! Please help me ASAP!