Hi, On my PC the only codecs I've ever installed are DivX, XviD, and 3ivx. This has always allowed me to view all my files. I recently re-formatted and installed those same 3 drivers as I always do. There are a bunch of HDV (m2t) and DivX (avi) files that I could view fine in WMP11 before the format. Now, none of the m2t files will play in WMP11 at all, and a couple of the avi files won't load, but most of them will (and these are all part of a set that were all encoded the same). To make matters even weirder, all the problem files play in VLC fine... so that would make you think the codecs ARE on my system... right? Any ideas? Thanks!