So, I took the plunge - knew I shouldn't have!! Installed Win 8.1 and now none of the setup I did for lightgun games works!!

Sadly, I think this area of emulation is really tricky and underdeveloped.
1) I had HOD3 working on XP with two aimtrak lightguns + Trouble-shooter driver (which allows two lightguns running at once). Tried setting this up on Windows 8.1 - no go! Crosshairs not picking up gun movements or inputs.
2) Had aimtraks working with PS2 via this route: Aimtraks (in Guncon mode) > Topgun drivers (via windows test mode) > Nuvee plugin > PCSX2
Again, working fine on (if I remember correctly) Win 8. However, since update to 8.1, can't install Topgun drivers, despite going through all the steps putting Win into test mode and then signing the drivers.
This is where my cab setup gets really frustrating! I'm not a coder and therefore can't solve this one myself.

Surely there must be others out there who are trying to set up lightguns on their cabs?? Sadly, it feels a very under-developed area and now have two custom-built lightguns lying about which are as much use as chocolate teapots.

Anyone else having similar problems?