Success :D
For anyone with Windows 8.1 and having the same trouble with getting a BSOD while trying to install an NVIDIA driver, and if you happen to be as slow as me (as if ^^; ), here's what happened;
I followed the uninstall directions linked above (and here) from the NVIDIA site;
http://www.nvidia.com/object/IO\_13955.html
It's in pre-Windows 7 speak, so you'll end up going to [Control Panel > Programs > Programs and Features > Uninstall or change a program], then find "NVIDIA Graphics Driver ###.##" (not exactly the program named in the instructions), uninstall just that one if you have multiple NVIDIA programs, and then go about installing the proper driver related to your graphics card from the NVIDIA site.
Everything looks totally fine after I did all that :D
=======EDIT=======
I did have this problem a second time, and as RameshRKR described, uninstalling the drivers and doing a clean install, but STILL getting a bluescreen. Couldn't use the new driver, the previous driver, even older drivers, beta drivers, not a thing would install without a bluescreen of frowniness. I did indeed put in a trouble ticket with nVIDIA, and they helped me resolve the issue.
What happened was, there were half-deleted corrupted files and reg keys and processes all over the place, and the clean installer couldn't remove them (I guess 'cause they weren't recognizable?). So the nVIDIA helper guy pointed me towards a program developed by an independent programmer, called the "Display Driver Uninstaller" (or DDU) which completely cleans any and all files that have ever been associated with nVIDIA or AMD or Intel (the option is select-able).
https://forums.geforce.com/default/topic/550192/?comment=4356570
(might need an account, I'm not sure)
WARNING though, as I said the developer is independent, so nVIDIA will accept no responsibility in case anything goes wrong. However, this is what fixed my problem entirely. After this, I was able to install the latest driver, and I'm still playing my favorite games at the highest graphics, no problem. If you wanna see how the whole thing went, all the problems I discovered along the way, and the solution I'm describing here, here's the forum post I made over on their community forum;