|It might, just might be possible that you don't have enough memory. If the 512 indicates the amount of memory you have, it might be worth adding another 512megs. The onboard graphics uses system memory, the higher the resolution, the more memory is required. 512megs is not really enough to run XP efficiently.|
Just a thought, but well done for finding this problem!
Computers... designed to entertain,help with work but most of all to frustrate you!