A littel less.
The culpirt was iexplore.exe. Stopping that process of course shut down IE. On loading IE again the usage is about 1/2 (121k vs 225k) ScanningProcess.exe is now at the top of the list. Scan is still fluttering although not topping out at 100%.
Have restored to earlier date; done virus scan, registry check, etc.
Thanks for the pointer.