It is part of the TabletPC options which you can select to install even on a non TabletPC. Go to Programs and Features under Control Panel and then click the Turn Windows Features On or Off on the left hand side of the dialog.
Absolutely, Bob. I use Snagit a lot too. It's fantastic. Different tool, different purpose. If you want quick 'n dirty, Snagit can't keep up with Snipping Tool.