The pesty ffdshow filter

Now both WMP and RealPlayer crashed on me (DEP message) when playing some media files. I tried Media Player Classic, same thing. Well, that looks like a codec issue since the crash happens with all players. I GSpot the files and found out they are all DivX/Xvid coded. I found the utility InstalledCodec and ran it to id my codecs. I first disabled my DivX5/6 and Xvid DirectShow filter/drivers. Didn't help. Then I spotted the ffdshow filter for MPEG-4. Disabling that fixed the issue. The ffdshow filter is 1.0.0.1 (size 1761280) at C:\WINDOWS\SysWow64\ffdshow.ax. It might the relic of a few video converters I tried.