Lost my WinVista admin password Was only account on my system I don't have any password reset disk plz help

Hello I have lost my windows vista admin's password.
It was the only account on my system.

I have not created any password reset disk.

Please help me about what can I do now?

Is there any way to overcome this problem?

thanks in advance for your kind help :(
Update: I would like to tell one more thing that It is having only admin user so on boot up in safe mode also,
it asks for the password for the admin user :(

plz plz help
6 answers 6