I have:
AC3MovieImport.component
AppleIntermediateCodec.compon
Flip4Mac WMV Advanced.component
Flip4Mac WMV Export.component
Flip4Mac WMV Import.component
Perian.component
as well, so unless it's a conflict between one of the above and another you have, it's reasonable to assume one of the above is not at fault. Hence, I recommend first checking the remaining codecs are up to date, and if not, to update them and test Front Row again.
If this does not resolve the issue, remove one of the codecs at a time, testing Front Row in between, or alternatively, remove all, and replace each one by one testing after replacing each codec.
iMac 24" Mac OS X (10.4.10) Lots of shiny toys!