So I've been using Windows 10 since I was able to upgrade with little to no problems. Then suddenly, on October 8th I think, during a Windows update all hell broke loose. Audio cut out, network connections went up and down, and the computer crashed within minutes. Removing the graphics card eased the amount of crashes, but even when stripped down to motherboard+CPU+hard drive, it still crashes (also, I tried putting the graphics card in a friend's computer with Win7, it ran flawlessly, were started up some GTA5 and no problems).
I get different errors, the ones I've had are:
I've "reset" my installation of Windows, but the error remains. When I restart the computer, I have to do it 2 or 3 times. Other times it just crashes, shows a blank "active" screen, or BSOD. I've updated the motherboard BIOS, downloaded the latest drivers, but still it keeps crashing and failing to reboot.
I'd like to do a clean install of Windows 10 (instead of a reset), but I am unsure how, since I upgraded from Windows 7: I don't have a 25-digit product key to enter. Any ideas?
MBR: Asus H97M-E (mATX)
CPU: Intel i7-4790K
RAM: 16 GB DDR3 (8 GB x 2)
GFX: GeForce GTX 780 3 GB