Yes!! l'm running Win XP
You should have DX9, and therefore be able to run the game.
But what if l reinstall the all computer ?? maiby then everything would be fixed right ??
Try that. The files may be corrupted. But I do not get how the demo worked.
But also l must check out first if this is all worth it becoz l can't just reinstall the computer becoz of one game but still if something else is wrong then l will make a list and also this was the first game that l played when l was 13 but now l wont to play it again now
I seriously do not really know what the issue is man. With the vague specs you provided plus the odd situation stated (demo works, but the full game does not), I cannot really help you further.