In Windows 7 or Vista, you can copy the path of a file to the clipboard by pressing the CTRL+C key.
All you have to do is hold down the shift key, and right-click the file:
Choose the Copy as Path from the menu. Here’s an example of what’s on the clipboard after clicking that:
“C:\Users\Public\Pictures\Sample Pictures\Creek.jpg”
Note: This will also allow you to copy the path of a folder to the clipboard.