I always get blocky playback when I play divx movies on WMP (XP version), ZoomPlayer, and BSPlayer, but they all play smoothly on Divx Player. I have DivX 3.11, Divx 5.1, and XVID codecs installed. ffdshow alpha filter didn't help smooth the playback either. Also, some movies take an incredibly long time to load (but would play eventually), and some movies won't even load on the majority of the players except for some (ie. ZoomPlayer). So my question is, why are there inconsistencies in playing movies with different players and what one player+codecs do you recommend to play EVERYTHING (including .mpeg extensions) perfectly? Also how do I manage (ie. delete) codecs in WinXP?