If you have it on another computer you can certainly transfer it to another one.
It will be located in one of three areas
C:\Users\YOUR USER NAME\AppData\Local\Microsoft\Windows Sidebar\Gadgets
AppData is a hidden folder followed this tutorial to see it Hidden Files and Folders - Show or Hide
they also may be in
C:\Program Files\Windows Sidebar\Gadgets
C:\Program Files (x86)\Windows Sidebar\Gadgets
Just copy the gadget folder you want to the same place in the other computer.