Xbox360 - No longer plays videos

[attackruby]

After installing a CCCP Codec pack (Was trying out tversity and someone said to download that) everything went haywire. PMS Stopped streaming videos, and so did tversity. I uninstalled CCCP and i still cant seem to get them to work. I can only do videos that dont require transcoding to stream which is almost useless since 90% of my files are MKVs.

After uninstalling and reinstalling everything still is the same.. nothing working.

Any help would be greatly appreciated