I had similar problem like Jun pergrin( see thread 18 October).
I read all the related posts, but still I am not able to solve the issue.
I am installing a regular licence of P3 5.0 standalone.
MSDE was already present on my PC.
At the P3login I have tried to insert login/password like the following admin/sa, sa/prima,sa/Prima , privuser/privuser, pubuser/pubuser
and this is the result...
"" The login name you specified was not found. Please use a different login name or choose Cancel to exit the application.""
I frankly run out all the ideas
My IT admin is lost
Could you help me??