Time Machine restore on new Hard Drive and now my login password not working

I just had a new hard drive installed and they put in a clean version of 10.6.

I got home and used my TIme Machine to restore from my other computer. It finished, but now I am locked out, bacause its not accepting my password. I know its my password, the hint is the same as I have always had. It just won't work,

Since the repair place installed the software, I don't have any other disks to boot from. Does anyone know a way to fix this or reset the computer again? I don't care if the files are lost, I can copy them over later. I just need to get past the login screen. Thanks!!