Numeric keypad not working properly

Hello,
I have recently upgraded to Windows 10 and now find that my numeric key pad is not working, it worked fine before upgrade.

I have an Asus G73s. Also had an issue with the back-light not working but installed ATK package and it works fine now.

Strangely when you use the Num Lock key the PgUp, PgDn, Home and direction keys all work, but when you switch back, the number keys don't work.

Any help would be appreciated.

Stag