I've Forgotten My Password For My Laptop, How Do I Unlock It With Out Password Or Disk?

I am giving you some suggestions, check them out:

1. Restart your computer in safe mode and then by pressing F8 again an again you can log in as an Admin. It will not require a password. Now go to user account and change password.
2. Reinstall vista and try to boot in the safe mode
3. Get more help from the given links:

Forgot Password