Hello,
If you installed (2) systems without any issues and only this one is having a problem, and all running the same software version, the logical conclusion is that something is wrong with the hardware in this 3rd unit, otherwise you would see the same issue with the previous 2 PCs.
Just to make sure, confirm that all settings are identical in all 3 PCs including screen resolution and Video driver settings.
I am assuming all are running on the same XP version as well...