As before, I think you need to eliminate hardware issues as a source of the problem before we can really figure out anything more. If you do a web search on that error, you get information like "This error has been linked to excessive paged pool usage and may occur due to user-mode graphics drivers crossing over and passing bad data to the kernel code." and lots of references to either hardware/driver issues, or software that runs drivers and other low-level system hooks (like Daemon Tools) which Terragen doesn't do.
There is also this article that claims it may be caused by a Windows Update, although I don't know if you're running Windows 8 (would be good to know):
http://www.tomshardware.com/faq/id-1653284/fix-system-service-exception-bsod-error-windows.htmlOther related info:
http://www.solvusoft.com/en/errors/blue-screen-errors/microsoft-corporation/windows-operating-system/bug-check-0x3b-system-service-exception/Even if it is memory-related, as I mentioned previously if TG runs out of memory it just crashes; it should not take down your entire system. Windows in general tries to protect itself from any random application causing system-level faults. Only system-level drivers and services should - in general - be able to perform operations that cause such significant errors.
So it seems that most of the info on this error seems to point to a hardware or driver issue. I would suggest running Memtest86+ for a few hours to check your memory (Windows Memory Diagnostic has not been as reliable for me). Also check to make sure all your drivers are up-to-date, especially your graphics driver. And check for that Windows Update mentioned in the article above if you're running Win 8 (just in case).
I hope that helps. If you are able to test your hardware and no problems are found, we can continue trying to diagnose it further, but unless we can duplicate the error on our side it will be difficult to get any more information.
- Oshyan