Windows 10: I want to reinstall windows 7 on my old samsung Laptop Model code:NB300V5AH

So i have a samsung laptop running windows 10 and it is very slow and i would like to reinstall windows 7 but i am worried but drivers issues or usb issues i have the product key under the laptop it is a windows 7 home premium product key.The laptop came preinstalled with windows 7 in 2012and i would like to reinstall it

:)

 

Cannot share/cast W10 Desktop to a later model LG or Samsung Smart TV  

Screen share works on all three of my Samsung TVs. Some things of note are:

• Sometimes I have to try several times to establish the initial connection.
• Sometimes the connection will hang or drop forcing me to restart the connection
• Occasional audio stutter
• I have to be deliberate with the mouse and keyboard because of the lag in response time

I can project using a Acer Swift 3 laptop (2018 model). The 55" Samsung TV (#4) is too old to support Miracast. To display the laptop's desktop on it I project to the Samsung Blu-Ray player (#1) which is hooked up to the Samsung 55" TV (#4). Note I have to first start the Screen Mirroring app on the Blue-Ray player (#1) for the laptop to see and select it. The two newer 43-inch Samsung TVs (#3) and (#4) both support Miracast. They automatically appear on the laptops connect list as long as they are turned on. Once I select one of them from the laptop a message appears on the TV requesting permission to connect. I have to use the TVs remote control to accept the connecion. Once I do that the laptops desktop shows on the TV. #1 [BD]J6300 = Samsung BD-J6300 Blu-ray Player (2015 model with Smart apps) #2 [TV] Samsung 7 Series (43) = Samsung UN43RU7100 (43" 2019 Smart TV) #3 [TV] Samsung 7 Series (43) = Samsung UN43RU7100 (43" 2019 Smart TV) #4 Samsung UN55D6000S 55-inch LED TV (55" 2012 Smart TV)

 

How to reinstall Windows 10 if my computers used the free upgrade from 7 and 8?

Will windows 10 still accept the license keys from 7 and 8 now if I reinstall my computer?

Does Microsoft keep a list of users who upgraded to Win 10 using their 7 and 8 keys so that when users need to reinstall windows 10 the old keys would work?

Do I need to call in Microsoft to ask them to activate my Windows 10 when I give them my win 7 keys?

Both computers are laptops. The windows 7 machine had the serial printed on the back, and I needed to enter that when I upgraded to 10. The windows 8 machine had the serial built in inside its boot system so I didn't need to enter the key when I upgraded to 10, but I did manage to write down the keys using a fetcher program.

 

Change motherboards without reinstalling Windows 7!

He is right here, Windows 7 does a fantastic job of dealing with that and it's about time!

Also a good point, have a backup or be comfortable doing it.
I am yet to have an issue doing it, even with a raid *as long as it was Intel to Intel* with windows 7.