Okay, I have managed to install the NVIDIA drivers now. It was a silly mistake, I did not change "MPS and ACPI MADT ordering" value from "MODERN" to "LEGACY" in BIOS. As you may already know, the former is for XP+ which I am also running and having it set incorrectly will cause (random) issues.
How did the new USB drivers go you ask? Well, they just work, its amazing! No frame drops, nothing. Mass storage still works as well. So huge thank you @MrMateczko for your help with this issue and @PROBLEMCHYLD for the actual drivers! Cheers!