Im trying to play on windows 10 but the game just keeps crashing after the initial splashscreen? is there a fix to this.

If this is for NWN and you are trying to make it run through Galaxy, then you can try to run the game directly from the installation folder without Galaxy. See if that works.

Sometimes the splash screens(intro movies) themselves can cause a crash. I have found the following settings help for NWN1:

in your nwn.ini

Under: [Display Options]

SafeMovie=1
Disable Intro Movies=1