I can't provide much advice for Pool of Radiance, since I don't have that game. But as for Neverwinter Nights...
Neverwinter Nights Diamond Edition is a native Windows 98/2000/XP application. It runs natively under Windows and has nothing to do with DOSBOX. But still -- it's over 20 years old. And, yeah, thanks - you just made me realize how old I am too. :-D
The Dell Latitude E5440 doesn't have a discrete GPU, so it's running all graphics processing off the integrated Intel CPU chipset. Unfortunately, integrated graphics tend to be very hit-or-miss with older games since they're designed to be a cheap, simple and minimalistic solution to provide basic graphics capabilities for modern applications. Your audio issues with the game are probably along the same lines. The original Neverwinter Nights uses an older audio system which isn't fully compatible with some modern budget sound chips. Most mainstream desktop motherboards with integrated audio should still compatible, but some laptops can use scaled down audio chips that cut legacy compatibility in order to reduce cost.
TL;DR: Most modern non-gaming laptops suck at being compatible with legacy games.
If you want a simple "Press the I WIN BUTTON and make it work" solution with minimal effort: just buy Neverwinter Nights Enhanced Edition. It's been completely rewritten to be compatible with current hardware and operating systems, and it runs MUCH better with laptops and other systems using integrated graphics and audio. Speaking from personal experience: I had a family member who could not get the Diamond Edition to run on her laptop for anything. She purchased the Enhanced Edition (on sale), and it loaded right up with zero issues. Definitely not worth it at full price if you already have the classic game, but it goes on sale several times per year for 50 - 75% off. This version is actually still being developed (albeit, very... very... slowly). In fact, there was a new patch for it just a few weeks ago.
If you want to press on with the Diamond Edition, try right-clicking on the NWN.EXE file in the game's installation folder, select PROPERTIES, click the COMPATIBILITY tab, and then try different COMPATIBILITY MODE options.
You can also try reinstalling the Microsoft DirectX Runtime Libraries, which will make sure you have the latest version of Microsoft's legacy DirectX drivers:
https://www.microsoft.com/en-us/download/details.aspx?id=8109 I also checked the PCGamingWiki article on the game (always a good first step), and didn't see anything else about graphics and audio issues:
https://www.pcgamingwiki.com/wiki/Neverwinter_Nights Good luck and may Tymora's blessings be with you!