Help PLEASE!

I am a mac user ; but my friend came along and asked help with his Samsung 300e notebook.

I went into the BIOS,and foolishly disabled every drive, except the one usb drive I created the Windows 7 image on.

I have tried every F-key (onboard keyboard and usb) and read up quite a lot about this subject, but I cannot get into the f*&Dcing BIOS!

It is stuck at the Samsung screen, and then restarts...

Please, please can someone give me any help?

Help PLEASE!