Hi Folks, I know this is no help... But I am using WMP 6.4.09.1121 on W2k having no prob with DivX5.05... and WMP6.4 (not sure wich version - to lazy to boot that machine right now - but latest 6.4 install package used) on a W98SE machine - DivX5.05 runs fine... and on a WinXP Home machine the MP6.4 wich came along with the install and no prob with DivX5.05 too..... But DaveEl is right, I think you will love MPC ;) (Still wondering why you cannot use the WMP.... as those three machines I mentioned differ widely in their specs I am not posting any details now, as I again think they wouldn't be of any help.... the only common element is that all installs were made by myself... and yes I use DivX for the decoding of .05 (and not ffdshow)) CU, SHAnDRA P.S.: Maybe this should belong into another part of the Forum as it is no GK Problem after all...