How to find which was first window installed on my system?

How to find which was first window installed on my system? or:How to find which was first window installed on my system?or:First windows is when you f

How to find which was first window installed on my system?

or:How to find which was first window installed on my system?

or:First windows is when you first bought your computer. If you had windows 8 pro but upgraded it to windows 10, you can find windows 8 pro in system settings under system restore. It will bring up a menu saying which windows you want to use (something like that) it will show windows 8 pro and windows 10. Exit system reboot so that you don't accidentally reinstall 8 pro again. I am a computer expert but havent messed with a computer in awhile now. My tablet is my form of computer. I like windows 10.

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