Problems setting up new domains after license install

[heypcguy]

I've been trying to setup Plesk 7.5 on a Windows 2003 server and I'm having some interesting problems. When I first install Plesk, I can do anything inside with no problems, create & delete domains and users etc. As soon as I install the license file I received from sw soft, whenI try to setup a new domain I get the error "Unable to update hosting preferences. Unable to create system user: Empty error message from utility" I am completely baffeled as this same process works with no problems before I install the license. If anybody has any ideas they would be greatly appreciated.