Vista - msn keeps changing my computer's language

when i receive a file or with no reason the language that i use in my
computer change's. i have greek and english and mostly is in english but it
changes suddenly to greek by it self. i scan the computer for trojan, virus
e.t.c and there is nothing, i even format my pc and still the same. does
anyone knows anything??? thnx

Msn Changes language wrote:Does the language of the computer change, or are you just reading a
document in another language?

You do know the difference, right?

yes it only changes the language that i type, not the language that i read
documents. fpr example i type in englsh and the next time i open the window
it turns to greek and i type in greek. i press the Shift+alt button to switch
back to english but this is really annoying.

it changes the language in the entire computer, not in office. i actually
notice that onle in msn. i haven't see if that goes on further than msn.