Hi Larry,
Thank you for posting the issue on Microsoft Community Forums.
We can imagine the inconvenience you have experienced. We will try to help you with this.
Here are a few steps which you can follow:
Method 1:
You can try using the Hardware and Devices troubleshooter to fix the problem. It checks for common problems and makes sure that any new device or hardware connected to your PC is installed correctly.
Open the Hardware and Devices troubleshooter by swiping in from the right edge of the screen, tapping Search (or if you're using a mouse, pointing to the upper-right corner of the screen, moving the mouse pointer down, and then clicking Search), entering
hardware and devices in the search box, tapping or clicking Settings, and then tapping or clicking Find and fix problems with devices. You might be asked for an admin password or to confirm your choice.
Method 2:
Refer the link below to download the keyboard drivers for Windows 7 and install in compatibility mode:
http://www.microsoft.com/hardware/en-us/p/wireless-keyboard-2000/E6K-00001#support
Follow these steps to install the drivers in compatibility mode and check if that helps.
a) Download the printer drivers from the manufacturer’s website.
b) Right-click on the driver and click on ‘properties’.
c) Click on the ‘compatibility’ tab and check the box ‘Run this program in compatibility mode for’ and select Windows 7 operating system from the drop down.
d) Click on ‘Apply’ and click ‘OK’ and run the file to install it.
Method 3:
Also please refer the link below and perform the steps given in the article:
Troubleshoot response failures in wireless keyboard or mouse
http://support.microsoft.com/kb/838398#top
We also suggest you to contact Microsoft hardware support for further assistance.
http://www.microsoft.com/hardware/en-us/support/contact-us
Hope this resolves the issue. If issue persists, you can write back to us and we will be glad to assist you further.