I prefer installing K-lite and after that I install every version of divx from 3.11 via 4 and 5 to 6, and after all xvid. all of these codecs overwrite the same installed with K-lite. So far everything is perfect and I keep doing this for quite a lot of time... it may sound a little stupid but every movie i put in my pc is recognised and played with no problems. i've forgot to say that i always use latest version of ffdshow filter...