In WINDOWS 7, by default, when you hover your mouse pointer over many items on the screen, after a brief moment Windows automatically opens the submenu. This assumes that whenever you hover your mouse pointer over a menu, you mean to expand it.   My suspicion is that it makes many more ads appear, which drives the Internet.  The good news is that it can be disabled.  Here’s how:

1. Right-click an empty area of the taskbar and choose "Properties". 

2. The "Taskbar and Start Menu Properties" multi-tabbed dialog box appears. Click the "Start Menu" tab. 

3. Click the "Customize" button. 

4. The "Customize Start Menu" dialog box appears. Scroll down and uncheck the "Open submenus when I pause on them with the mouse pointer" box. 

5. Click "OK" on the dialog boxes to close them.

APPLE  Similarly, it can be fixed in Apple from the “Control Panel—Applications—Trackpad” screen.   Simply de- select “Tap to Click.”  Tap should probably say touch as it is ultra sensitive. If you turn that off you can still actually push on the touchpad until it clicks which is a more positive tactile response, and you’ll stop sending Emails in mid-preparation.