Help please? T_T

So, for the past week, my computer has been doing some really weird things with the taskbar.

Which is to say, it keeps "doubling up," for some reason.

Reverting it to a previous point fixes the problem, but only temporarily. This actually started after I installed the most recent Windows XP updates, but other than that, I have no idea what's going on. It's severely irritating, because I have to move everything around just to get things visible.

If anyone can help me, I would really appreciate it. T_____T