There is a correct way to ask for help, and an incorrect way to ask for help.
Firstly, the forums do contain helpful information and there are many who will help with these kinds of problems, but it is highly recommended that you send in a support request to GOG support. After all, you made your purchase from GOG, so they provide support for getting it to run for you.
Secondly, posting on forums in full caps is considered to be the equivalent of shouting and/or angry. Neither of these is a good way to attract help from others who might help you.
And lastly, with the accusations of GOG's installer being corrupt (which it clearly isn't as there are many users who have NWN1 running it fine on Win7 x64 as evident from various forum posts - there is the possibility that your download is corrupt though, but there are ways of checking whether or not that is the case) and coming out with statements like "IS THE FIRST AND LAST TIME I EVER BUY ANYTHING FROM THIS SITE", it just comes across as very much like a child's tantrum, which again may put others off from helping, and indeed some users will deem it pointless to try to help you. But of course, it is your choice whether or not you continue to purchase games from GOG.com, but you'll miss some absolute gems of games if you don't.
As this is your first purchase and with you being a new user, I'll put the above down to inexperience and will offer some advice. I can't make any guarantees that these suggestions will work as all computers are different what with different hardware and different software, so what works for one person may not work for another, but it is worth trying anyway.
So, looking for possible solutions; well, you've tried running the game as admin, but did you install it by running the installer as admin? And avoid Program Files (x86) as some older games just don't get on well with it - partly UAC and partly DEP being the causes as old games were never written to handle these newer security measures, so installing into an unprotected folder can solve some issues. Also, as is mentioned in a few of the forum questions, some users have to run the game from the NWNMAIN.exe which is the one exe you said you didn't run (I don't know why chose not to use it). And as Tallima said, you may need to run as admin or try different compatibility modes on the NWNMAIN.exe to get it working correctly.