Vista - Added domain, now I'm locked out of everything!

So, I brought my vaio notebook to work, and in order to log on to my company's network, I had to add the company's domain. That worked fine, and I was able to long on. Now, however, I'm unable to access anything but my company's domain. I've tried to just logon as administrator locally, but all of my local usernames are locked, and when I try to unlock them, I get an access is denied message! I want to remove this domain from my computer, but I cant access the buttons to change the ID or the Domain/Workgroup .. they're all grayed out. I dont want to do a full restore, because I have loads of data on here that's not backed up! Someone please help!!