gjslaw:
Have you tried deleting all auxiliary files? Even after you delete the aux. files, I think Studio still keeps a lot of junk in a folder called Render. In XP, you can find it (for Studio 12) at C:\Documents and Settings\All Users\Application Data\Studio 12\Data\Render.
How to thoroughly manually Delete all Auxilliary Files etc, in
THIS Post.
BTW - I've seen as many as 35GB Posted on the Forum
.