XP running with SP3 on my system is giving me lots of problems with trainer. I've switch back to my old backup system with SP2 and encounter no such problem. Looks like SP3 is still not perfect.
I Have SP3 and i havent had any problems with trainer.
I used NLite and Slip-Streamed SP3 into instalation. Then i installed XP. I Didnt use via Windows-Update. Maybe there is other updates that breaks it