Create a Usefull Name for My Computer

Start/Run/Regedit

HKEY_CLASSES_ROOT\CLSID\ {20D04FE0-3AEA-1069-A2D8-08002B30309D}.

Data Type: REG_EXPAND_SZ (Expanded String Value). Rename the value named "LocalizedString" to "LocalizedString.old". Create a new REG_EXPAND_SZ value named "LocalizedString", and set the value to "%USERNAME% on %COMPUTERNAME%".
Exit the registry editor, click on your desktop and press F5 (for refresh). The "My Computer" icon should now be rename to "Username on Computername". 

(you may need to restart or log out of Windows for the change to take effect.)