Marc, HERE is a back link. 
Tony, you might go to the "make movie tab", and locate the big blue disc. That's the drive that your files are located in. Click the folder icon to the right of the disc, and that will bring up a "Browse for folder" window. You can use the scroll and go up and down until you see the "render" folder.
The default location is buried sorta deep in the tree, I prefer to keep it on my desktop for easy cleaning. You can change the location by simply using the window, and creating a new folder where you want it to be.
If you just simply want to leave it in place, place a simple shortcut on your desktop.
I don't know Vi$ta, but you still might (hopefully) find the render folder the way I explained.