SWF Problem

I have 4 PC’s in my office all with Flash on them.
Now when I go to click an SWF it says:
Windows cannot find Documents.exe.

This program is needed for opening files of type ‘Flash Movie’

Location of Documents.exe:

Has anyone had this before? It’s happening on 2 of the machines. And coincidently I have just upgraded the plug-in to Flash 7 but all machines have the Flash 6 software on them [All legit’ too].