Check to see if your "Human Interface Device Access" service is running.
I can confirm, having that service set to Manual or Disabled is INDEED what's causing the problem! I was having the same problem on my computer, so I set that service to automatic and started it and voila! the problem was gone! Thank you very much Ashrak007!
CCleaner breaks MCE and MCE Remote on Windows 7
in CCleaner Bug Reporting
Posted
I can confirm, having that service set to Manual or Disabled is INDEED what's causing the problem! I was having the same problem on my computer, so I set that service to automatic and started it and voila! the problem was gone! Thank you very much Ashrak007!