Quicktime will not play any video files

When trying to play any compatible video files .mov, .mp4 etc... all I get is a small black box in the upper left corner of the screen. The computer is not frozen I can close the window with the red x. I can open Quicktime and the web stuff opens but opening a video file on the computer causes this. I confirmed the latest version of Quicktime in installed and I have confirmed the video files I'm trying to play work on another computer and the .mp4 file plays in media player on this computer. The video card driver is up to date. I want to play my .mov files from my iphone but can't.

all I get is a small black box in the upper left corner of the screen.
Curious ... I wonder if this is a blown-out display preference?
Could you check something for me please? Create a new user account on the PC with full sdminidtrative rights. Log out of your usual account and log into the new account. Try playing a file in the new account. Does it display properly?
If it works okay in the new account, let's try to get things working in the normal account again with the instructions from the following thread:
http://discussions.apple.com/thread.jspa?threadID=2637322

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thanks in advance for your help
Message was edited by: magneticjak
Message was edited by: magneticjak

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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