I share your frustration, usually I can pick the problem almost straight away!
In dxdiag,txt I see
And, can you make a new dxdiag.txt and post just the Display Devices section please.
Assuming the above don't help, can you tell me in detail about your machine and monitor please? Being XP we don't get much detail from the files.
In dxdiag,txt I see
whereas setup.log saysCurrent Mode: 1280 x 800 (32 bit) (75Hz)
Can you try setting your desktop to 60hz refresh rate please?RefreshRate=60
Resolution=1280x800
And, can you make a new dxdiag.txt and post just the Display Devices section please.
Assuming the above don't help, can you tell me in detail about your machine and monitor please? Being XP we don't get much detail from the files.