WMV files will not play in WMP using FireFox ver 7, downgraded back to 3.6 and all works just fine. Running XP Pro on four machines and the three that were upgraded to ver 7 could not play the wmv file, you receive a protocol error.

I had all plugin, addons and what not configured along with serching every site possible to try and fix this. Let me know when you get a fix.

hello.   hey, thanks very much for writing back.  i got some good info with a search or two.  (info about what regedit is and what corresponds to it in OS X -- regedit allows you to edit "preference" keys for individual programs,  OSX's equivalent for these keys are the .plists in User & System: Preferences and Application Support)
what i ended up doing was uninstalling Premiere Pro (not the suite, just PPro).   Then i deleted a few preference files:
from User /Preferences/Adobe:
com.adobe.AdobePremierePro.plist
com.Adobe.Premiere Pro.5.0.plist
and from System Preferences:
the file:  Adobe Premiere Pro Prefs
and..
/.../Premiere Pro/5.0/...
AMEPrefs.xml     (i noticed that there's also a preference file in Media Encoder's own folder so i didn't sweat this one)
Debug Database.txt
Placeholder Preset.epr
PostEncodeCmds.pref
PresetCache.xml
Trace Database.txt
NOTE:
of course i don't know if deleting any files beyond the 2 .plist files in User Prefs was necessary, but...  it seems to have worked.
I then reinstalled Premiere Pro CS5, and fired up an old project and i've got playback of HD and DV files, and snappy editing and rendering,  so hopefully i'm good to go.   I'm just going to stick with v5.0.0 because i actually don't remember ever having any trouble with it, and i don't remember v5.0.4 adding anything i was 'missing' or 'needed'
hopefully, this thread will be useful for any future folks that run into trouble - and it's got a solution for both Windows and OS X
happy editing,
peace

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