In most cases, you’ll pick USB Mass Storage, but the other options might solve problems if your Android device doesn’t show up
the menu down from the top of the Android screen, and pick USB connection. In most instances, you’ll want USB Mass Storage to be selected. (I had to perform this step on a Droid X because it set itself up in PC Mode first.) But try PC Mode if the software isn’t finding your Android; that might solve the problem.
On your computer, click the phone icon in the upper-left section to select your Android. On the Android, prepare the moment you want to capture. On the computer, choose Device, Screen capture. Click Save. Repeat the process for extra screenshots as needed.
Get to the Root
If you’re a savvy Android enthusiast, you can shoot screenshots without hooking up to a computer at all. First, however, you’ll have to root your phone.
Normally, the Android OS prevents screenshot apps from working, because they muck around with deeper permissions. The rooting process confers superuser abilities, however, granting you permission to do anything you want. After rooting, search the Android Marketplace for screenshot to find various apps such
as Screenshot, and Screenshot It. You’ll activate screenshots with a timer, by shaking the phone, or via another command, and the app will then capture your device.