I agreed to the upgrade a few days ago. This morning I can not log on properly...getting BSoD and indicating registry problem. never had this problem before. Have it open now in safe mode should I try the ‘Open System Restore’?
Yes. Try a restore point from BEFORE you agreed...
UNLESS you updated since then, or added ANYTHING new, you might go back to the LATEST system restore point and try that first.
Went to May 31 restore point and it seems to have worked.