Thanks Kevin, I did that before the reinstall. But it gets worse: Last night the reinstall worked ok,but tody if I load any project with Waves plugins, I get pop-ups:
(i) VST Plug-In error ... The following plugin failed to laod: (8000ffff) c:program files\common files\vst3
(ii) Microsoft Visual C++ Runtime Library ... Runtime Error! Program: C:\Program Files\Cakewalk\Sonar Platinum\SONARPLT.exe ... R6025 - pure virtual function call
(iii) Sonar stops working (unsurprisingly given (ii).
EDIT - FOLLOW UP - with support from Waves:
I had WaveShell-VST3 9.3_x64.vst3 still present in the system and this was clearly causing an issue, given the waveshell is now v9.6. I've deleted it and the plugins are present again now. Many thanks to Waves support for sorting this.
jdf