I resentaly got a video file that I did not have the codecs to play it. So I searched for it and found one but it was different than the other codecs I have installed on my computer. It told me that since I have windows me I had to unzip them in to c:\windows\system and open up one of them that was like "install_register" or something so I tied it and it said in a the ms-dos box that it was a bad command. So I tried again and got a message box that said something like "D llRegisterServer in CoreAAC.ax failed Retern code was 0x80040154" so I deleted those files from there thinking that they did not work. But then some of the video files I was previously able to play would not work and the excuse the player gave was "Unknown Exception caught" so I eventually came to the conclusion that I screwed up some of other codecs that I had in c:\windows\system. So I uninstalled all of the codecs I had and the player I usally use and tried to reinstall them, the player installed fine but still would not play any thing so then I tried to reinstall some of the codecs I had on it but as it almost finished an error poped up and said "c:\windows\system\xvid.ax Unable to register the DLL/OCX: DllRegisterServer failed; code 0x80040154 Click retry to try again, Ignore to proceed anyway (not recommmended), or abort to cancal installation" I tried retry many times but the same thing keep pop up again and again. So I was wondering if anybody could help me to fix it? Thank You.