you must search drivers by yourself, please be aware that you need to set BIOS to Legacy instead of UEFI, this can arise some hardware issues:
- video gprahic corruptions
- touchpad not working or having hiccups
- windows 7 drivers not availables
- Legacy is less safer than UEFI
windows 8.1 is a good OS, windows 10 is even better; i would suggest you to try a windows 10 clean install (after creating a recovery media to re-install windows 8.1 in the worst case).
you can also explain a little better, what do you meant with "here are also some problem with the OS even when upgraded to OS 10".
maybe a simple BIOS or drivers update can solve those issues.