I can't get my Neverwinter nights Diamond edition to work at ALL
Iv tried all kinds of things and advises but I just can't get it to work

seriusly! what is wrong with that game? >.<

Might be helpful if you tell us what is happening when you try to run it. Are you getting some sort of error? Do you get a title screen and then nothing? Crashes?

Also it would be a plus to know how you;re running the game. Direct download and install? GoG Downloader? GoG Galaxy?

It's always a plus to give details when asking for help.

As well as OS, GPU, CPU, etc...

If you're on windows 10,be sure to turn on legacy mode.

Xp sp3 or sp2 compatibility mode. Running as Admin.

Don't run the menu for the game. Run the game itself (I think nwn.exe).

Is super easy to run from galaxy.

If you're running the game and it's multilayer isn't working, be sure you have an individual key.

If you have weird graphics, turn off Shiney water.

If you're dying a lot, don't use wraps in both hands and get your ac up.

That should take care of 98% nwn's problems.

Check in the proper forum. There may already be posts that provide help.
https://www.gog.com/forum/neverwinter_nights_series

Try here: http://lilura1.blogspot.com/p/nwn-utility-visual-mods.html

It's my site but it's a decent starting point for setting the game up and troubleshooting.