Why does Sims 2:Seasons automatically open in 800x600 resolution on my PC?

(Mods, if this should go in CS, please move as you see fit.)

I have my monitor resolution set to 1024x768. For some reason, whenever I play Sims 2: Seasons, it switches to 800x600. This annoys me to no end! I can’t get the aspiration bar and the daily living bar to show up at the same time, which forces me to switch back and forth 294 times a “day” and screws me over some times. Can anyone tell me why this is happening, or (more importantly) how to fix it? Thanks!