i updated my Conexant HD-Audio SmartAMC HD2 now my speakers don't - mat

i was doing some automatic update and the updater said something about
optional updates and Conexant - Sound - Conexant HD-Audio SmartAMC HD2 was an
optional update. i figured there might be some sorta problem with it and that
is what the update was for, and now (since i restarted my computer) it says
no audio output device is installed. I went to the device manager to try to
roll it back but the roll back driver box is gray. what should i do now?
thanks in advance