Avid install some kernel extension in /System/Library/Extensions/ they where probably called Avid* some are (my remember) for managing drives.
Avid come with an uninstaller you SHOULD use it.
you can try to reinstall/uninstall to go that working.
You couuld also trash Extensions.mkext and Extensions.kextcache in /System/Library just by doing these two line in the terminal:
sudo rm -Rf /System/Library/Extensions.kextcache
sudo rm -Rf /System/Library/Extensions.mkext
there are cache file for OS X extensions.
You MUST reboot after that.