I recently changed to Windows 10 because of the end support for 7. I did what HT suggested, got a new SSD and installed Windows onto it from scratch, using my Windows 7 key to register.
One problem I encountered was not being able to move across an old copy of Photoshop Elements that I originally got with a graphics tablet years ago. So I'm using an old copy of Gimp to do the same job now. The other problem was that Canon don't make a Windows 10 driver for my old printer. I could get it to print with a Windows 8 driver, but not scan. So in the end I just bought a new printer. Moral is, check all your software can be moved or updated and that you can get hardware drivers.
Windows 10 works fine, it took a day or so to get used to things like right clicking on the start button to get into the nuts and bolts of the system. I don't like the standard image viewer and have replaced that with Irfanview. The biggest worry I have with Windows 10 is Microsoft completely borking my system one day with one of their mandatory-but-not-very-well-tested updates. However these can be delayed so its just a question of watching out for problems on the net after each one surfaces. Also when I installed Windows I left a bit of space on the SSD unallocated so I can install some version of Linux there as a backup OS. Not sure which one yet, need to do some research first.