Easy. Boot into safe mode (f11 or f6 or one of those while booting) and run cmd and log on to Administrator. Then do:
net user Driver *
[press enter]
[press enter]
You might need to run cmd as administrator (right click and do "Run as Administrator") but probably not.
Now there is no password on that account. You can also replace Driver with Developer if you need to change that one too.
I've actually put a local back door on my family's computers just in case they screw something up. Don't worry, it's password protected
