How To Stop Grouping Similar Taskbar Buttons in Windows 7

Step 1. Right click the Taskbar and select Properties.
Alternatively you can click Start -> right click an empty space in the Start Menu -> click Properties.
Or if you want to take the long route, you can click Start -> Control Panel -> Appearance and Personalization -> Taskbar and Start Menu.

Step 2. Click the Start Menu tab from the Taskbar and Start Menu Properties window that appears.

Step 3. Click the Taskbar tab -> from the dropdown menu next to Taskbar buttons, under Taskbar Appearance, select Never Combine.

Step 4. Click Apply -> click OK and you’re done.



Ref: http://www.findmysoft.com/how-to/Stop-Grouping-Similar-Taskbar-Buttons-in-Windows-7/