Thank you guys for helping me, I successfully converted my C: drive to GPT and am booting through UEFI mode.

I followed all the steps and the error "MBR2GPT Not Working (Disk Layout validation failed for disk 1)" disappeared. Unfortunately, a new error appeared. It states: "Cannot find OS partition(s) for...

I backed up my C: drive and set it as a primary partition but I can't seem to find a way to shutdown my D: drive. Could you help me with that?

I filled in profile with my specs as you asked. My C: drive is is Legacy which is why I was attempting to convert it to GPT. I installed Windows 10 from a bootable USB drive that I installed. To my...

Here is the Disk Management image you requested:

275478

I have a Alienware 15 R3. Here are the specs:
-Intel 7700HQ
-32GB RAM
-Nvidia GTX 1070
-1TB SATA Drive
-256GB SSD

I attempted to do this but I get a message saying:
DISKPART> create partition primary size=100

No usable free extent could be found. It may be that there is insufficient
free space to create a...