Address book phone numbers use Greek dialling code?

If I open a contact in my address book (MS Outlook 2002 SP3), and double
click on just about any phone number, it specifies the Country/Region as
being Greece rather than Australia. How can I reset this to Australia?

I suspect this happened because when I first bought this laptop I took it to
Greece while on holidays, and perhaps have accidentally set something.
Regional settings in Control Panel are all ok for Australia and English
(Australian).

I also suspect this may be related to a REALLY freaky thing I occasionally
experience. Typing happily in Word, accidentally hit some unguessable key
combination because my typing is so innaccurate, and BINGO, I am typing in
Greek!! The only way to re-set it is to re-boot. Not important but
interesting!

Thanks, Al.