Hi Tarek,
I'm Dyari. Thanks for reaching out. I will be happy to assist you in this regard.
May I know what Windows edition is currently running on your computer?
Please click Start > Type winver, hit enter > Screenshot it, and post it back.
Also, which license edition did you purchase?
If your License and Windows edition are matched and since your computer is not joined to a domain and don't use any AD account, you only need to activate your Windows with your own license key. Your user profile should remain the same. However, you can backup your C:\Users\Your User Profile folders just in case.