Thanks to each of you that took the time to answer. And thanks for providing answers to to the actual question ... and not going off on all manner of tangents inquiring about the type of cooling system i use ... or video card or whatever.
And then of course there are the usual answers that...
OK ... I've read a bit and see that a system requires UEFI to convert disks to GPT. I have three drives in my system that are 128GB SSD's. They are strictly for storage of data.
I am on a system that is UEFI compliant, i.e., BIOS is UEFI BIOS - WIN10 - 64bit - 32GB ram - latest WIN10 updates...