Disable Windows Snap

Aero Snap will help you to maximize, minimize and resize the windows just by dragging and dropping it into the screen corners. It also takes up unwanted resources and causes system lag.

1. Open the Control Panel and double-click on Ease of Access Center icon.
2. Now click on the Make the Mouse Easier To Use.
3. Now tick the check box saying Prevent windows from being automatically arranged when moved to the edge of the screen.

Note: After you disable Aero Snap Feature, you won't be able to use some of the new Windows 7 keyboard shortcuts used to move the active window around the screen[s], e.g. Win+Left Arrow, Win+Shift+Right Arrrow, etc.