OCModShop posted a Vista guide: Use Check Boxes to Select Files in Vista
Use Check Boxes to Select Files in Vista
Have you ever been confused about which files you're selecting in Windows Explorer? Has your mouse been so sensitive that you accidentally select more files than you meant to? What about moving files to the wrong directory? The intuitive drag-and-dropability in today's User Interfaces can make it very easy to manage your files, and can just as easily wreak havoc on your hard drive!
Windows Vista has a new feature in Windows Explorer that is very useful.. checkboxes! Instead of holding down the Ctrl key and clicking a bunch of different files to select them, you can just click the checkboxes no more accidentally copying the files or getting to the bottom and losing the selection. The only caveat is that it isn't turned on by default.
Use Check Boxes to Select Files in Vista