OK many thanks to the guys on Where can I download Windows 7 (legally from Microsoft)? who provided links to d/l the WIn7 .ISO images.
Now where can we find a similar listing of the md5 hashes for those files? [I was using one of those downloads and was beating my head against a wall because of an error during file unpacking - turned out my image was corrupted. Downloaded again and it worked perfectly - could have saved myself 2 days of frustrated googling and lots of hair if I had just checked the hashes before starting :-( ]
I managed to find one or two md5 nos but not for the specific file I'm looking for. Someone somewhere must have them all? I'd have thought the Digital River d/l site probably has them but I haven't yet found a way to access the parent pages of any of those downloads - the links in the page I referred to above all take you direct to the downloads.