In this case it was 65gb. I found it using SpaceMonger. Stop the Symantec Endpoint Protection Manager and Symantec Embedded Database Service. Rename / Delete the current log Click Start, click on Run and...

It pretends to install but has an internal error and rolls back, then has to reboot. Happens over and over. Uninstall completely, run the uninstall tool, and reboot. Open regedit and navigate to the key...