Belkin Numeric Pad not functioning correctly under Windows 10

[GiorgioF]

I am using a standard Apple wireless keyboard together with a Belkin Wireless YourType Numeric Keypad. Both work fine under OS X El Capitan but in, for example, Excel under Windows any entry in the Belkin results in focus jumping about the spreadsheet or jumping windows. I assume therefore that a 'signal' is being received but that it has little similarity with the key pressed!

Any suggestions for getting the numeric pad to function correctly?

This is my setup

 

[Sylvester@Parallels]

Hi,
Please follow the below steps to fix this issue.
1. Follow this article and reinstall Parallels Tools.
2. Choose Virtual Machine > Configure > Hardware and select Mouse & Keyboard in the sidebar and choose Optimize for games or Auto detect for games.

 

[GiorgioF]

Thank you for support @Sylvester@Parallels I've followed your directions but the input is really slow. When I type a number the number appear after few seconds...