Hi Az, thanks for your reply. I will respond to your thought by number, okay.
1. My case has plenty of ventilation and overheating is probably not the culprit
2. I have a 1200 watt power supply and I never seem to tax it, being it has ample power. Some say 1200w is overkill, but I feel the more watts the better when running a reasonably powerful PC.
3. I run a CPU meter from IOBit and it never seemed maxed out at any time I was converting videos. The videos I'm converting are anything from just a few minutes up to an hour or so, but the freeze up can occur on any sized video at any given time. In some cases it's just a few moments, other times it can freeze up with just 5% to go.
4. I will alter my power settings to be the same. I usually do that early in Windows setup, but this time I was so busy reinstalling all my programs and researching some others.
5. I recently had the dreaded BSOD and nothing I did would reset Windows to start normally. I tried Startup Repair; starting in Safe Mode to undo what I thought may have crashed my PC; using CMD as Administrator to run sfc /scannow, and even resetting Windows, all to no avail. Even an Acronis backup would not take.... I got a message saying that Acronis could not perform a restore operation on the drive selected. In the end I just wiped the drive and reinstalled Windows from scratch.
As for with converter, well I tried several from Any Video Converter; Freemake Video Converter; Wondersoft Video Converter to Handbrake. All did the same thing, Windows froze up and I had to do a forced reboot. I did do a Google search and didn't find a lot to help with my issue. One suggestion may have helped but I'm not too sure as yet if it worked.
One person suggested to make the output folder on a different drive to the input files as there may be a conflict if there was not enough free space on the drive, and being that the output folder was on the same 120Gb drive as the input folder, it very well may have been the cause. Once I moved the output folder to a different drive I tried again to convert a couple of files. One was only 4 minutes long and the other was 1 hour 22 minutes. Neither froze up and each conversion completed successfully.
It is probably too early to tell because the freeze ups were quite random, but here's hoping it is fixed. I purchased Ashampoo's video converter in the hope it'd resolve the issue, and it performed those final conversions without a hitch, and it's very easy to use, but I'm not counting any chickens just yet.