What do you want to pin to taskbar,actually you almost can pin any item to taskbar in windows 7.
Pin Applications / Programs to taskbar
It’s very easy to Pin Applications / Programs to taskbar in windows 7,just go to Start and locate the application you want to pin to taskbar then right click it and select Pin to Taskbar.See below screenshot as example.
Pin other Non-Application items to taskbar in Windows 7
1.Right-click a empty place of you desktop,select New—Shortcut
2.In this step,you can type in the command to pin what you want to be pin to taskbar
2a)Pin file or folder to taskbar.
Just type in explorer <full path of your file or folder> ,the below screenshot pin
D:\Downloads as an example
2b)Pin Administrative Tools to taskbar in windows 7 ,just righ-click and
select Properties to get the target of to tool,and type the target in
2c)pin other item which could be format as “command” to taskbar in
windows 7,pls refer following posts
3.Click Next and type a name for the shotcut and click Finish
4.Go to your desktop,right click this shortcut and select Properties
5.Go to Shortcut tab and click Change Icon
6.Type in shell32.dll or imageres.dll or wmploc.dll in then press Enter to select proper icon for this shortcut
7.Go to you desktop and right-click this shortcut and click Pin to Taskbar
8.All done,good luck.