Windows 10: My pc says I have 40 gigabytes that I can't find anywhere.

I was checking my storage to see if I had enough space to download something, and noticed one of my categories said I had 40 gigs, so I checked I had already done the math previously because of another issue and I had nowhere near 40 gigs, so I looked up some solutions and installed an app called WinDirStat, and even when checking the unknown files, they were only about 18 gigs, I tried temp and %temp% as well, and that didn't help, so I was wondering if anyone had any solution to my problem?

:)

 

gigabyte Z370 HD3 + Samsung EVO 970 won't install Windows 10

Newly assembled system:

• Gigabyte Z370 HD3 V1.0 motherboard
  
• Intel i7-8700 CPU
  
• 2x DDR4-3200 16GB RAM (F4-3200C16D-32GVK)
  
• Samsung EVO 970 500 GB M.2 SSD (MZ-V6E500)
  
• Thermaltake TR2 S 500 W PSU (TRS-0500P-2)
  
• Deepcool Tesseract case (seems doesn't matter)
  

All components come new, unpacked.

Windows 10 Pro installation failed at the step "Getting files ready for installation." when about 70-80% complete.

I used both the original Windows 10 Pro DVD and a USB stick prepared by a Microsoft tool; the result is the same.

I tried to use the pre-installation SATA driver from the Gigabyte website.
Once I installed this driver at the step "Where do you want to install Windows", my M2 drive had disappeared from the list.

The same situation repeated with another set of components.

By the way, when I try the same set of components but with an ASUS Z370-P motherboard, there is no problem with Windows 10 installation.

I still need to assemble some systems with Gigabyte motherboards.

Update: It was easy to install Windows 10 on the SATA SSD. Same conditions: Gigabyte motherboard, but SATA SSD instead of M2 SSD.

Any suggestion what to do in order to install Window properly?

 

Gigabyte 990FXA-UD3 (Realtek) - No bass/sub-woofer

• Speaker Setup plays all speakers fine
• Applications do not play any bass through subwoofer (or really, at all)
• Custom built PC using Gigabyte 990FXA-UD3 motherboard onboard audio.
• Windows 10 fresh install
• Tried latest driver from Gigabyte, Realtek, and Microsoft
• Windows "default" driver does play bass through sub-woofer, but audio stutters and is quiet.

Not sure what else is relevant to mention; I've tried following various posts with suggestions to fix this, with no success. I've been at this for quite a few hours and am very frustrated.

Please let me know if you have any questions, or suggestions on how to resolve

 

PC Build Steps

Ok just because I like steps i am going to create some steps. Please give me the stamp of approval/disapproval

• Install system in case
  • Remember to connect SSD and optical to same SATA ports on motherboard
• Turn on PC
• setup HDD
• run blend test in prime95 for 30-60 min
  • run realtemp at the same time

• While in Prime95 test
  • if CPU goes above 70c in RealTemp, I have a leaky CPU
  • if my system locks up or blue screens, there is an instability in the system somewhere
  • if my system does not lock up or blue screen, my CPU is not damaged and I am in the clear!

What do you guys think??