Here you go , Hats ! I'm not sure if you've ever heard of it, but, there's a picture viewer called Irfanview, that is able to do screen capture . It is able to run on all Windows versions . I use it for pictures myself , & I run Vista . My Dad has used this program for years , so that's how I found out about it .
Here's a download link : http://www.irfanview.com/
A link on how to use Irfanview for a screen capture : http://malektips.com/irfanview-screen-capture-full-window-desktop-mouse-cursor.html
Maybe this will help .