version 11.4-11.6 doesn't work with 8 NVIDIA video cards in system win7.
just closes when the program starts...
how can you solve the problem?
From what I've read Windows 7 will only manage 6 GPUs, try it out and see if your rig works with 6 cards.
If it works with 6 and not 8 then upgrade to Windows 10.
Windows 7 has issues with anything more than 4 GPUs - sometimes 5 if you're lucky, and there was a site that showed how to "patch" the drivers to work with more but that site has been down for a while.
I believe the same limit applied to 8/8.1 but I gave up on 8 a couple years ago when the UNUSABLE INTERFACE wasted 6 hours of my time trying to do one SIMPLE thing (FIND the pre-installed mining software and configure it and RUN it) and wouldn't let me do so no matter what I tried, causing me to blow 8 off the system entirely and replace it with XUbuntu (took me perhaps ONE HOUR to do a "from scratch" install, do all the needed updates, install drivers, install mining software, and have the system MINING - and I could have done it faster had I been paying 100% attention to the system).
I recommend a move to LINUX, which is currently running 7 various mixed Nvidia cards on my ASUS B250 Mining board under the 384.98 drivers with no issues (other than a KNOWN "doesn't report the power limit data correctly" bug with 1050 and/or 1050 ti cards but you can still SET the power limit and it works).