Avi, mpeg and mov problems

I`m having no luck playing streamed .avi, mpg and .mov ( all video) files.
The avi and mpeg video files freeze up upon start up and only show the first second of the video for the first 5-10 minutes. After that they play fine although with no sound. They also play and sound fine after being downloaded and then opened.
The mov files only show the sliding bar or , after being saved , the blank QT screen with the bar sliding and no sound.
Also , the QT "intro" on apple.com/quicktime (the timberlake video) refuses to play properly, it just comes in very "blocky" with only occasional sound bits getting through. The same can be said about some avi files, when they do work.
I have flip4mac , divix, 3vix, xvid installed. Tried perian but that completely killed all streaming avi playback , just a Q with ? mark. Downloaded AC3 codec and put in the QT folder. no luck.
These are the sites in question.
http://www.justintimberlake.com/QuickTime/justintimberlakeqt.html
http://www.geocities.com/Heartland/Prairie/1568/videos/riki_discovers.mov
Couldn`t find any avi movies to use as an example.
Last question. Is there a way to automaticaly stream avi and mpg files in the same QT screen as wmv and asf files?
thank you and sorry about the long post.
imac intel core2duo Mac OS X (10.4.8)

Try VLC media player regarding playing .avi files.
===============
I had no problems playing the Timberlake video. However, when I tried to play your second link (.mov) all I got was the bar, no audio or video.
Regarding your 1st link, have you tried repairing permissions & restarting?
Regarding your 2nd link: Apparently, it's a bad video link & no fault of yours or your computer.
====================
"Is there a way to automaticaly stream avi and mpg files in the same QT screen as wmv and asf files?"
The following is a work-around for .avi files. Not sure if it will also work for .mpg files.
Open the file with QuickTime Player.
Open the Movie Info window (Command-i).
Note the name of the video codec used in the file.
Do a Google.com search for codec name +Mac and download one appropriate for your OS and computer.
Quit and relaunch QuickTime after installing the new codec.
Try the file again.
Thanks to QuickTimeKirk for the above info.
================
Regarding no audio sometimes................
If repairing permissions does not work, then try the following:
KB article - No sound from some applications, but system alert sounds play (Mac OS X 10.3, 10.4)
Another trick: If you have GarageBand installed, open it and then quit.

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