PDF Output: "Windows cannot find $display"

In running a PDF OUTPUT, user gets popup error box:

                $display:         (can look like "Sdisplay")

Windows cannot find '$display:'. Make sure you typed the
name correctly, and then try again. To search for a file,
click the Start button, and then click Search.

                   OK

The problem was resolved by associating Adobe 6.0 with all PDFs, and installing the newest java client.