Windows 10: why is one drive not working on my computer, and MOST IMPORTANT HOW TO DO I FIX THAT ASAP

why is one drive not working on my computer, and MOST IMPORTANT HOW TO DO I FIX THAT ASAP

:)

 

Programs not working

In post 26 there were steps listed to fix the operating system corruption.
Are you able to follow them?
In post 29 was the suggested dism repair command.

 

Most important computer hardware?

How would you rate the importance of each hardware computer component in a powerful yet stable system? Here is my list, #1 being the most important.

1- power supply unit
2- motherboard
3- central processing unit
4- random access memory
5- graphics processing unit
6- hard disk drive

 

Screen size does not fix.

Since the new upgrades the screen size is too big for my 7 YR old Toshiba Laptop, which I use constantly. I Can not access the x or the scroll bar. The character's are Hugh, stretched and distorted. I have followed every single step listed in troubleshooting
and even paid two computer techs to fix it. NOTHING WORKS! There used to be a simple one step adjustment: Settings: Display: Screen Size. Neither, Resetting, troubleshooting app, driver updates, changing to another resolution (which btw is suggested as a
fix but non existant) nothing works. I am at wits end. The last guy I paid to fix it suggested I just buy anew unit? I can't afford that. Please please address this issue asap. Thank you