Actually, I'd like to find out what skins you guys want to see go on sale. So I've put up a little survey (with images, because I'm sure a lot of people can't remember the skin names), so you can pick your 3 faves and submit the votes to us. We'll be running a (likely) 25% discount on some skins then based on those results. Rather than have me guess what you guys want to see go on sale, you can just tell me :)
Here's the link: https://www.surveymonkey.com/r/Nosgoth-Skin-June
Have you tried Pinnacle? I used it for Fable:TLC, and there's a profile for it for Legacy of Kain. (link) I hope it works!
Use this computer to go to this site: http://www.systemrequirementslab.com/cyri Type Nosgoth into the game search system and run it. It'll tell you if you're able to run it or not. From looking at your specs, you should be able to run it no problem!
I'd pin a mmorpg.com beta key link somewhere easy for everyone to see as it's just bumped it up to 8,000 beta keys. Link here
Any other issues with the OS or other games?
Use a different SATA cable to connect the HDD/SSD or just re-plug the same one if an extra ins't available.
Can you download HDTune and run a health/error-check scan? Is it an HDD? An SSD? What model? Firmware updated to most recent?
If the PC with problems has more than 1 memory stick installed, can you remove all but one and do a test?
Can you try changing the DNS of the PC w/ issues to Google's DNS? Steps here. (Remember to clear it if it does not help)