cannot export h.264 in premiere

After the latest updates to Adobe Premiere Pro we can no longer export h.264. It has always worked fine.

I am getting errors like this...
incomplete video codec found in the preset. Preset load failed

and

"Quicktime Export Error
Quicktime for windows cannot export H.264 on computers that have more than 16 CPU cores due to a problem in the Apple H.264 compressor component."


Any idea what would suddenly do this with the latest update?

We are running Windows 7. If you think more details are needed let me know and I will get those.

Thanks

yes, however this machine has been working like this for a long time. Suddenly after doing the most recent CC updates it will not work, and is giving me these errors.