These instructions are for windows 8, but vista is almost the same.
You have to find the control panel and then open "appeanance and personalization". Then you open folder options , click the view tab, and click "show hidden files, folders, and drives".
The red arrow below shows you where to click.
You will then be able to see the folder you want in
C:\Users\your name\AppData\Roaming
where "your name" is whatever your windows user name is.