Can not troubleshoot Random Freezing or isolate cause

I have Asus Z87 Deluxe, CPU Intel I7 4770k Quad Core, Hard Drive Western Digital 4TB SATA HDD, Monitor Asus 24 class LED, Video card Asus HD7790. Running windows 8.1 pro with media centre (x64) (build 9600) It boots into legacy mode. My BIOS is American Megatrends Inc. 1007. I know there is a later version, but I am a little paranoid to flash the Bios concerned I may Brick it.

I am experiencing random screen freezing and I am not sure why. I believe I have the latest drivers for all hardware.

I am at my wits end having had this problem for a month now. I am not to tech savvy to be honest. What I am thinking is my windows should have been installed in UEFI mode ( I am thinking this only because I am running out of things to try). Do I have to do a clean install to accomplish that and if doing so is that likely to solve my problem? Most of the freezes happen when I am working on the desktop with more than one program open (but not always) but quite often it involves playing a video.

Hey,

I would install the latest version of the USB AI Charger, ATK, and anything else you have installed from them.

You'll likely have to check Windows 7 for the latest, but check 8/.1 first. Downloads/Utilities section @ ASUS.

Then when done, disable antivirus, close all software not necessary and install latest bios. If you use Task Manager to close some things, wait a few minutes to make sure you didn't make a mistake and close a critical process down.

nice motherboard ,
it has ASUS CrashFree BIOS 3,[allows you to load bios from usb if you runinto problems ]so you don't really need to be nervous about the update