lion won't accept my password. HELP

Hello

I had to change my hard drive. I reinstalled Snow Leopard with the DVD that came with my Mac Book Pro. Then, I used my time machine to recover all my information. Everything worked just fine. Then when I wrote down my password to log in, it didn't recognized my password. After many times of trying a crossed circle appeared, so I had to erase the HD and do the process all over again. This didn't work because it won't accept the password again.

Is there anything I can do to recover the password or to make it accept it.?

I had the Lion OSX in my time machine.

Please help so I can use my Mac again!!!

Thank you

ADTM