I am using QT 4.3 comerical ( also have tried 4.2 ) to compile my application

If I build in windows xp, and then run it on either windows xp or vista, everything works and mysql connects and my querys work

If I build it in windows vista, and then run it on either windows xp or vista, everything works except mysql wont connect, it gives the error of "Driver not loaded"

ive setup both environments the same

visual C++ express 2005
Microsfoft Platform SDK
QT 4.3 comercial

and they both build fine, with the same exact compiler output