I think I know what you're talking about...i thought you could control that with right clicking the name and selecting properties, but you can't.
do this:
Start>Control panel>User accounts/ After that, click on your account name and choose 'change my name'. If your boyfriend isn't nice, he might have set your account settings to where you can't change it...

If you
can change it, then that means that you can change his name!
edit:
you can also change your picture if you want.