In Windows 7 the taskbar button displays only program icons. Of course it lets you save taskbar space and also looks beautiful, but some times it is bit difficult to recognize what application this icon is representing.
You can easily change this to Windows XP or Vista style. Right click on taskbar – select Properties – and select ‘Combine when taskbar is full’ or ‘Never combine’ option under Taskbar menu and click OK to save. That’s all. If you want, select Use small icons’ to have a small button as in XP or Vista.