The Windows 7 and 8 Taskbar has the Libraries Shortcut pinned to it which takes you to the Libraries i.e. Documents, Music etc. but not to MyComputer. Here is how to add My Computer.
a) Unpin the Libraries shortcut from the taskbar.
b) Right Click on Desktop and click on New > Shortcut.
c) Type the following in the location:
C:\Windows\explorer.exe shell:MyComputerFolder
d) Click Next. Type any name for the shortcut and click Finish.