How come RegTest takes down Sandboxie?

I ran the regtest inside sandboxie and it took down my computer down to just a barely functioning task manager and that was the only thing that worked. I thought that Sandboxie would withstand this registry assault but obviously not.

 

I tried it with SD and it made the registry changes in the virtual mode. On the 2nd test it made the computer reboot and was wiped out by SD.

 

RegTest does slightly more than alter the registry during it's test, just to ensure it can reboot the computer effectively, which is what you are seeing. If Sandboxie does what it claims, the registry should have been ok I would think.