I have done the reset several times, everything returns to the original values. It still doesn't see the plugins even though everything is at the original values. I use the old functions often. For example, the QUICKTIME plugin is important.
Interesting solution as I had this issue some time ago (i5 intel) and what was happening was the tbb.dll file was being read from the intel folder rather than the Vegas folder. So the solution was to copy the Vegas tbb.dll file to the intel folder location (reversible so long as you rename the existing tbb.dll file in the intel folder first). This solved it for me and some others who had this issue at the time.
2) (optional) Remove following files if they exist: ...
C:\Windows\System32\intelopencl64.dll
C:\Windows\SysWOW64\intelopencl32.dll
@BREDOK Out of curiosity I checked my systems. None have those dlls, older systems have nothing in registry below
../Khronos\OpenCL\Vendors\
and newest 11900k has no references to Khronos at all. I think yours may have been leftovers from old Intel drivers. I regularly use DDU when rolling back Intel graphics drivers which I believe clears out obsolete references like that.