I installed my audio drivers (intel high definition audio) from the MSI website, i restart and great! my sound works in iTunes and in F.E.A.R. combat, where they didnt work before.

so then, i go to www.giggity.info and watch an episode of family guy, i then go back to F.E.A.R. and i get the same sound problem as i had before installing drivers and in itunes the music wont play, but the video's on www.giggity.info still work! Windows error sounds also still work, but itunes and fear sound dont work!

how can i fix this?

(i have xp pro, intel p4 3.4ghz and 2gb of RAM)