9500 GT is from mid 2008, therefore some hardware generations behind the actual 9xx GTX cards. Driver wise you need to use the legacy driver (actual version 341.81) which is only updated security wise but not for performance. The last driver for legacy cards was released end of August, maybe they fixed some Windows 10 related problems too. Device Installations Settings are ignored by Windows-Update.
Yeah. I have 341.81 now. Hopefully more compatible with 10--so far, so good. Before I had one from mid-2014--think that could have been related to instability I was experiencing?