As others have commented re: this thread, it depends what program you are running,
and, as in M$ Office, you can change the type of measurement units used in the
options of that and various other programs.
Windows, is usually set to default to using the metric system anyway.
However, you could double-check that the following setting it correctly set to
"Metric" and not "U.S." :
1). Go to the "Control Panel" and open "Regional and language Options"
2). On the first page [tab] called "Regional Options" click on the "Customize"
button.
3). Again, you want the first page of the new dialog that pops up ("Customize
Regional Options").
4). Go down to the very last item on this page called "Measurement System"
5). Make sure it is correctly set to "Metric" and not "U.S."
Finally, if you changed anything - click on [ok] to exit "Customize Regional
Options", and again on [ok] to exit the "Regional and language Options" control
panel.
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Cheers, Tim Meddick, Peckham, London.