Hi,
something in the build of your tap driver went wrong - which is why it's crashing your system (blue screen).
Nobody will be able to answer *what* went wrong, though, I'm afraid - none of the developers build drivers on 8.1, we use old and trusted build systems (my TAP driver extentions have been done on WinXP, I think Samuli builds the official drivers on Win7). Since the old NDIS version is deprecated by Microsoft, it might well be that there is something in the 8.1 WDK that just breaks our driver.
Since we have a new NDIS6 driver - see
https://github.com/OpenVPN/tap-windows6 - which uses the up-to-date API, it doesn't seem useful to invest time to debug why the old driver does not bild on Win8.1
What are you trying to achieve anyway? I'm a bit curious, because building the TAP driver is so much hassle that nobody does it without having a really good reason.
gert
