Here's the fix.
plugin manager
vst configuration - options
check - rescan failed plugs
check - rescan existing plugs
ok
scan vst plugs
Now in the vst box, I see not only Waves RComp Mono but also RComp Mono
select RComp Mono and at bottom see
c:\program files (x86)\cakewalk\vstplugins\waveshell-vst 5.0.dll
select Waves RComp Mono and at bottom see
c:\program files (x86)\cakewalk\vstplugins\dxshell.dll
So now all waves pluggins are fine.
It's good that I copied all Waves vsts from my other Win7 install to this current install, since shell2vst didn't work. It took the reset and rescan to have waveshell-vst 5.0.dll work