upgraded from win7 to win8 for windows media center for which there was no improvement so ive had media portal on test for a few weeks now (very happy with it). however it seems to have a problem with the tv service crashing and no one seems to know why so im going to downgrade to win7 again hoping this will solve the problem. before i try all this, do i have to install any codec packs in order to get media portal working once installed on win7?