There is a solution to your problem:

When you bought your computer or Windows XP, there was a CD. On that CD contains all the tools needed to reinstall it. When you reinstall it, then you can resupply a password and the problem will go away.

If that's not what you want to hear and want to know how to crack the password, go elsewhere. We do not give that kind of help here because how do we know this is NOT your box? We don't wanna be responsible

regards