i have this problem.
i have winxp sp2 and about 2 month ago all old games was working nice, but then just stoped to work, when i try to run warcraft 2, it say that is not a valid win32 aplication, when i try red alert too..
so only older games/aplication dont work, and is not a game/aplication problem, cause i tried it on my other winxp machine (that dont have sp) and there i can run older games...
maybe is sp2 a problem ??? cause i installed it latter i think...