SnagIt allows you to capture the entire contents of a scrolling area. It’s very fully-featured and it’s not free ($39/year) but it’s well worth it in my opinion. As with any other software, make sure it’s not setting itself up to launch automatically when your computer starts up.
SnagIt
Ever need to make a screen grab that's longer than your screen? Before I discovered SnagIt I'd spend a few minutes using Photoshop to glue screen grabs together and wondering what I'd do if I didn't have Photoshop.