Enter key becomes the letter P??

I hope this is the correct forum...Every once in a while lately after booting , my "Enter" key types the letter P every time I hit it, like nowpppppppppppppppp....Can anyone figure this one out? Sometimes it goes away on re-boot, but has just come back again..................................................Any help is appreciated........................Now I just found out that the right arrow key brings up the Windows 'getting started with internet explorer' box..................Help

 

Turn your keyboard upside down and blow the keys out with air compressor. Or...Try another (good) keyboard. You may have some stuff in the keys.

 

Well, after a shutdown and restart everything is back to normal.

I have no idea what this is but hope it's gone for good...

Thanks