Languages in Windows XP

[KARL]

I am currently using a computer at work which has more than one language installed on it, English being the default language, including keyboard (as far as I can tell). Why is it that when I point the mouse at things ("last modified" for files, the time on the task bar, etc.) the date comes up in another language even when I am in English ? How can I get a match with the language I am working in at any given time ?

[vehelpfulguy]

Go into "Control Panel" and choose "Regional and Language Options". 

Make sure everything, on all three tabs, says United Kingdom.