This issue has nothing to do with PC settings at all.
As it was described in the forums by another player (sorry, I forgot his name) these issues are caused by IE memory overflow when releasing opened tabs, as well as coding errors in Game Client (for the existence of which I'm sure admins will deny)... I believe (as we're advised to update software to the very latest versions) that it comes to a version mismatch... meaning that XP users are doomed to crash as we can't use IE ver. 9.
planet-x
My advice is that you wait for the new Chrome-based Game Client. Until then, don't open forums... or use browser for that.