gah, so it's old.
ok, if you can read dutch enough to do this, go into control panel, and look for regional and language settings (the icon looks like a little globe, there may be more than one little globe though). if this is XP that was originally english, but was transformed into dutch with the microsoft MUI kit, there should be 3 tabs instead of just 2.
if that's the case, the 2nd tab is where you'll get the most things back into english (there are drop downs on that tab, at least one of them should have the word "english" in it) change everything you can find on that tab and the third tab to english, and then press ok and apply and then it will force you to restart.