The reboot is caused by my selection of automatically restart in case of system failure in the System Properties Advanced Menu. If I shut off the auto restart, I get a BSOD with a message of PAGE FAULT IN NON-PAGED AREA.
THe system failure occurs during the Bad Link Cleaner operation (even in Scan ONLY SAFE Locations!)
I've tried msconfig.exe minimal booting (diagnostic setup with basic devices and services only), and it still crashes during Bad Link Scanning.
FWIW, I also use JV16 Powertools 2009 (v1.90-540), and the system reboots during both quick system analysis and during registry cleaner scanning, like RegVac scanning. Because of the way JV16 is set up, I haven't been able to localize where in the scanning process the crash occurs, except that it is about midway though the scanning modules.