Hi,
Thanks for the input. Just reran sfc /scannow. It went to 44% then died with the same error code. Ran the script you provided. It went through about 100 iterations of a cycle of "verifying 100 components, beginning..., verify complete", until the last cycle. That never completed. All entries were info, no errors or warnings.
Then downloaded setupdiag. The basic log file output said it was unable to match to any known failure signatures. Will try to sort through the files in the zipped dir. A number of the xml files had an insufficient disk space string in them. Not sure if that was a perceived condition or just one of several potential responses. Selecting properties for C: show about 60% free. Will start digging, but the narrative for the diags indicates it could be above my skill level.
thanks again,
pete vh