well...you must clean install...if your upgrade 7 to 10...its like ride 2 car in 1 driver...1 car in the TOP..and 1 car your driver it...i recomended ..clean insatll win 10...
security updates are over rated. if windows 7 works good for your hardware and if u use your computer for general use not for any important work go for it.Windows 7 has some life left.I still use it.
In addition to what others have said, Windows 7 could actually prove to be easier to use given its classic interface but games and other software will soon stop being made for this OS.
If you have less than 8 Go of RAM aid definietly suggest. I run windows without updates all the time. If you know what you’re doing you don’t need them
You should probably stick with Windows 10 considering how Windows 7 has been depreciated at this point. Maybe this is a problem with your hardware (i.e. maybe you're underspecced for Windows 10)?