I'm working on my sister's computer right now. Specs are i7-4790k, Asus Z97-A/USB 3.1, Gigabyte Windforce GTX 970, Corsair R750i, Crucial 480 GB BX200 SSD, Coolermaster Hyper 212 Evo, Crucial Ballistix 8GBx2 DDR3 Ram, Seagate 2TB HDD, originally running Windows 10 pro 64 bit. Computer is a little over 2 years old, originally built in December of 2015. Starting last November, it would randomly freeze up, no mouse movement, no clock movement, completely frozen. We have gone through and updated all drivers and BIOS, as well as check all connection inside the PC. When attempting to get into the BIOS, it again will freeze. We went back to 8.1 84 bit and had no issues. However, my sister has some software she needs that she only has windows 10 keys for. Just looking for any possibilities for what could actually be wrong. Thanks!