Maximum PC

So I've been getting this error for a few months now and it doesnt prevent me from playing anything its just really annoying.
It will come up sometimes when I just open a folder containing a video or always when I click on to play it, but then it will play fine usually in Windows Media Player as thats my default player(dont hold that against me please ).
So it seems it has to do with the thumbnail of it?
The little error window is the annoying part it doesnt wanna close even after I close the folder window. No matter if I hit OK, the X, Close window in the bar, End Task in Task Manager, none of it will work per say, after awhole lot of clicking all of the above it will eventually close randomly....usually.
Any help or suggestions is appreciated thank you.

Try installing the latest version of the xvid codec and see if the error goes away.

I feel stupid this absolutely worked thank you. I swore I tried it before but I think I just tried reinstalling cccp and not just the xvid one, regardless thank you very much again.