The following keyboard drivers appear to block several keys, including colon and backslash in DirectX 10 and other applications:
Microsoft eHome Remote Control Keyboard keys
Microsoft eHome MCIR Keyboard
Microsoft eHome MCIR 109 Keyboard
HID Keyboard Device
When I uninstall these drivers, the blocked keys are again allowed. However when I restart (or unhibernate) my computer, the drivers are restored.
How can I permanently remove these drivers?