Graphics settings and calibration

Hello there,

I have installed GP3 1.1.3 a few times now on different systems.
It is incredible how GP3 seems to be a little bit picky for the configuration
such as Graphic-cards, drivers....
My last installation on an old AMD Athlon 2200+ with old Nvidia 2 GTS was a horrible adventure!
First I forgot the decrypted exe and wondered about this CD-message!
Second, after this was fixed, I made the mistake to calibrate the Graphics. After that the game wasn´t playable at all!
it was more like a "Dia-show". All uninstalled, next installation! This time I checked the Graphics without calibration
and tested the software-mode, just to look what happens. After that I wanted to change in
HW-mode again but it wasn´t selectable anymore! So everything new and in normal HW-mode
without calibration again it was not playable! Laggy and very, very slow...
Next changed Nvidia-driver (from 71.84 back to 45.23 on ME). After that it was OK, but the resolution is fixed on
1024*768 and is not changeable! And it looks less good as my older installations.... What is it???
Is it possible to fix this? Why is it so?(but not on my other PC with MX4000 + 71.89).
I would be very pleased for any answers.
Thank you and Best greets,
Pete