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There is no Windows 9. Windows 8.1 followed 8, and 10 followed 8.1
As far as I'm concerned, Windows 10 is much better than Windows 8 or 8.1.
You *can* stay with Windows 7, even though support has ended. Just be sure to get and use third-party security software that is kept up to date.
If you would prefer to go to Windows 10, first make sure that all your hardware is supported by it, and that all needed Windows 10 drivers are available for your computer.
If that's not a problem, please describe your problem in more detail. Tell us what "I cannot load windows 10." means. Exactly how are you trying? What happens when you try? If you get an error message, please quote it verbatim.
You can install Windows 10 here:
https://www.microsoft.com/software-download
The minimum requirements are:
Windows 7 SP1 or Windows 8 (Windows 8.1 update)
1 GHz processor or faster, or System on a Chip.
1GB RAM for 32-bit and 2GB for 64-bit.
At least 16GB storage for 32-bit, and 20GB for 64-bit.
Graphics: DirectX 9 with WDDM 1.0.
And a 800x600 display.
Also you need to have an activated version of Windows.
Your problem may be because your PC doesn't meet the system requirements.
Did they skip from 8 to 10? Or did I miss an entire upgrade?