ok now I understand what you tryna say.
1. does external keyboard work when in the bios?
2. If yes backup every necessary files in external media and press "del" or "f2" immediately you power on your operating system (that is if you have tampered with the factory os partition of your hdd) to run bios setup make "cd rom" your first boot device from boot priority
3. Re-install your windows 7 os by inserting your bootable os cd/dvd and press any key when prompted
4. follow the wizard to complete your installation
5. Re-install original oem drivers viola
let me know if this solves your problem