Have you got all the latest patches for your games there si patches for most games especially dealing with XP you should also goto the website of said games and check there forums out you will get your answers there as many people post on them saying the same problems.
go to
www.google.com and type in "splinter cell games forum(s)" the same for other games you ahve these sites have all the latest patches
good luck
sorry my bad i ahve just read your post again i see you ahve got all patches but try the forums for the games sites