Hi guys, just a question for anyone who can help really, I'm using windows 8 and there's this Windows 10 upgrade coming along...Could I still play my Neverwinter Nights and Neverwinter Nights 2 when I upgrade to Windows 10?

The better question: will Win10 be compatible with anything?!

According to GOG, both should work. See their game pages, under "Works On":
http://www.gog.com/game/neverwinter_nights_diamond_edition
http://www.gog.com/game/neverwinter_nights_2_complete

It really depends on so many factors that it's impossible for anyone to give you 100% answer this early.

Check this: it is definitely possible, but your mileage may vary. Maybe there will be more posts there.
http://forum.bioware.com/topic/559664-running-nwn-in-windows-10-post-your-results-issues-here/

it's really impossible to know if anything works on anything until you actually try it. GOG has obviously gotten the games to work on their test machines, as mrkgnao noted, but whether or not it works for you is a different matter, you're the only one who can test that.

Neverwinter Nights also works for me under Windows 10. The cutscenes play very well in Windows 10. But if I stop playing the game then I always have to adjust the picture because then the picture remains very light. I do not know how to explain it, but it seems as if it no longer automatically goes to the original image. So the picture stays light while the picture settings I set myself (Brightness and Contrast 50%, Gamma 30%) are still on the correct number. Does anyone know how to do that?

I don't remember noticing that, but your problem sounds like the one described here: https://www.gog.com/forum/neverwinter_nights_series/game_makes_everything_brighter Worth a try?

If anything else fails, you could explain your problem in detail in the Neverwinter Nights specifc subforum.

Why wouldn't they? Been using windows 10 for years now after moving on from win7, not had any issues, although the auto-updating is a pain. Windows 8 was pretty poor as an operating system, I could understand moving from 7 which was better, to 10.

I haven't been able to play NWN1 on win 10 without some serious issues - like transparent menu, increasing lag, etc...

True, and one that is rarely asked. In fact, almost every one of these Windows 10-related threads blames either gog or the devs for not getting the game working right on Win10, instead of blaming Microsoft for breaking all backwards compatibility. I mean, Microsoft could've made the OS backwards compatible, but why should they bother? It will sell regardless of what they do. Apparently Win10 is already on well over half a billion computers. Maybe they get a bit of bad press for a short while, but they still rake it in, and take absolutely no blame for abandoning all the old software. Given the huge churn of press MS generates all the time, anything bad will be drowned in short order, anyway. Instead, people would rather have companies like Beamdog that graciously make old stuff work on "modern OSes" for an additional charge. Five years from now, we'll be hearing the exact same complaints about the latest OS from Redmond, again blaming the game devs for not continuing to maintain software long after making substantial money from it (or blaming gog for daring to sell it). Where's the backlash against Microsoft? I guess nobody cares, because they "have" to use whatever crap MS gives them (disclaimer: I don't use Windows). Yes, I know some people do, in fact, blame MS, but these are few and far between, and even those still want gog or a Beamdog-equivalent to fix the mess, knowing that MS won't.