I'm getting a "Missing Required Windows Service: TabletInputService" warning

The situation:

I'm getting a "Missing Required Windows Service: Please ensure that required 'TabletInputService' is running" warning and cannot start PDF Annotator.

The solution:

"TabletInputService" is part of the Windows operating system, and required to run PDF Annotator.

To start this service, and to configure it so that it automatically starts with Windows, please follow these steps:

1. Click the Windows Start button.
2. Type services.msc and hit ENTER.
3. You will probably have to confirm this step if you have administrative rights, or get your Administrator confirming it.
4. Scroll through the list and find "Tablet PC Input Service". Double click it.
5. Click "Start" to start up the service.
6. Set "Startup type" to "Automatic" and close the Properties window with OK.