[dieKatze88]

you need to find a program that will remove *EVERY* Codec on your system the old fashoned way.

Then you need to restart your computer.

Then you need to run a registry cleaner.

Then you need to restart your computer *AGAIN*

Then you need to reinstall Windows Media Player

Restart your computer again.

Install CCCP Again.

Restart your computer one last time

Try and play a video.


Edit:
Codecs are WICKEDLY finiky beasts. DO NOT SKIP THE RESTART YOUR COMPUTER STEPS. FOLLOW THESE DIRECTIONS AS THEY ARE PROVIDED AND IT SHOULD FIX YOUR PROBLEM.