Can't run Divx & other setup files

I have been having problem since i updated my PC to Windows ME. I can't watch Divx movies on Windows Media PLayer anymore since the upgrade. I can hear the sound but i can get no video. At the bottom of WMP it says "error downloading codec" So i have been trying to get an updated Divx Codec player installed but have been having problems. I can download the setup file to my desktop but when i try to double-click and run it absolutely nothing happens. I also have a problem with the Qucktime and a couple other intallers. However, i recently downloaded and ran the SpyBot installer with no problems. Why do some work but others not? Please help. I have downloaded the new Divx version from 3 different sites but none of them have worked yet. and when i try to run it from its current location, after it is downloaded nothing happens.

Any suggestions would be greatly appreciated. Thank you,
Jason`

 

Well i was finally able to get the Divx Codec and i can now see the video on Windows Media Player but it is super lagging. I am running an old PII 266 w/ 64mb ram but my old computer was just as slow but I didn't have any problems watching Divx movies on its WMP. I'm having withdrawl from not being able to watch movies. please help me speed up WMP! The sound plays normaly but the video is really really friggin slow.

thanks,
jason