Ok, part 1 - turning "Snap" on or off video:
http://windows.microsoft.com/en-US/windows7/How-do-I-turn-Snap-on-or-off I could probably wait and put part 2 here as well, but that doesn't help increase my post count now, does it?
Here's just the directions:
To turn Snap on or off Open the Make the keyboard easier to use page by clicking the Start button

, clicking Control Panel, clicking Ease of Access, clicking Ease of Access Center, and then clicking Make the keyboard easier to use.
Under Explore all settings, click Make the mouse easier to use.
Under Make it easier to manage windows, do one of the following:
To turn Snap off, select the Prevent windows from being automatically arranged when moved to the edge of the screen check box.
To turn Snap on, clear the Prevent windows from being automatically arranged when moved to the edge of the screen check box.
Click OK.