Hey All
Had the same issue. uninstalled and ran the clean up. Tried exporting machine file and have the same message as above. Found the antenn32.dll in the following locations below

I grabbed one and pasted it into

I didnt need to reboot TBC it just worked straight away.
Only small issue I had as it wouldnt paste here to start off with using windows. Must a permissions issue. Normally it would come up with some warning and you select allow but this didnt on this occasion. I used speed commander and this pasted over easily.
Regards
Bevo