Robert_Charlton - 6:35 pm on Sep 12, 2013 (gmt 0)
Do you have the same default location settings in both machines?
Are you logged in? Is search history on or off? (Note that, paradoxically, you can only turn your search history off if you are logged in and are accepting cookies).
To turn personalization off, try appending "&pws=0" to the end of query-string. Then recheck results.