PvZ Garden Warfare loads normally but mouse and keyboard are not responding

Do you have any controllers/gamepads connected?

If you have software running for a controller, close it all up.

If your controller is working, you could try to navigate to controlls and check them to be sure.  Disable controller maps.

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Clean Boot:

http://support.microsoft.com/kb/929135

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You can try forcing Borderless Mode;

C:\Users\admin\Documents\PVZ Garden Warfare\settings\PROF_SAVE_profile

NotePad

Borderless

GstRender.FullscreenMode 2

GstRender.FullscreenScreen 1

FullScreen

GstRender.FullscreenMode 0

GstRender.FullscreenScreen 0