Windows 10: How do I activate my PC operating system?

Hello all,This is my first time requesting any help with my PC from this community, but I made a silly mistake with my PC that I can't fix myself. I recently purchased Windows 10/11 Pro from the Microsoft Store, but I grew dissatisfied it after about 2 or 3 weeks, so I requested a refund. I received the refund & the funds were credited back to my credit card, but I didn't think that I would have to activate the previous OS Windows 11 Home, & I don't have the proper credentials to activate it because I installed it through the Windows Insider Program. Oops! I initially had Windows 10

:)

 

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.

 

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??

 

operating system language problem

I have upgraded my windows 8.1 to windows 10 in August 2015. Since then I am struggling to change the operating system language but not able to do it as I cannot understand Dutch in which the system got upgraded. I bought this lenovo laptop from Netherlands,
so it has default operating system language as dutch. I tried many tips suggested online to change it but not able to change it. Please suggest how can I get rid of these problem. I want to have administrative language as English. Please suggest step by step
procedure. It is even difficult to figure out which is pc setting option, recovery option or update option in dutch.

Thank you.