Vantage 4.00 and Microsoft XP Pro compatability

Vantage 4.00.803 / Progress 9.0B Full client running under Microsoft
XP Pro
Has anybody tryed to run Vantage 4.00 on an XP machine?
We just added a few machines with XP Pro, I'm getting this message:
Could not connect to server for Database V:\Vantage\db\Vantage, error
0. (1432).

Thank you, Jerry.
Phone (847) 678-1192