Yes ... if you did not Password Protect the built in Administrator Account
If this is XP Home boot into Safe Mode ... Hit F8 ... it will go to the default
Admin account .. for the Login type: Administrator ... for Password ... leave it blank
Once you get in, type Control Userpasswords2 ... from there you can Delete or Reset
your Account Password
Now if you did Password the Built In Admin account and you forgot that password
then you need a Password Reset CD
This site has links to some programs that will do it:
http://www.petri.co.il/forgot_administrator_password.htm