Here ya go:
How to take screenshots of your Android based phone from Windows – Simple Help
You may have to add a path variable if your running a windows 64bit Operating System:
* * On Windows, right-click on My Computer, and select Properties. Under the Advanced tab, hit the Environment Variables button, and in the dialog that comes up, double-click on Path (under System Variables). Add the full path to the tools/ directory to the path.
Example: ;C:\Program Files (x86)\Java\jdk1.6.0_18\bin
Also one pointing to where the tools folder in sdk is located.
Example: ;C:\Users\PFE\Desktop\android-sdk-windows\tools