Pressure sensitivity problem in Photoshop CS3

Normally, my Intuos3 tablet is able to easily distinguish pressures when I'm using it for drawing, painting, etc. However, just recently the pen stopped recognizing pressure sensitivity in Photoshop CS3 altogether. I checked the tablet's properties and everything's working fine with the pen, but I'm still very frustrated about the fact that it stopped working right after I had it for hardly a week. I have this tablet, and about after a week it started being weird with the pressure... when I hover it, it would draw. Back then, I just increased the pressure needed for it to show up and it worked fine. However, its now even gotten so bad that if I just hover it, it acts as if I'm drawing. If I draw, same.
Then, occasioanlly, it just doesn't show at all...

and then an even lesser, but more-than-one-time occurance, I will have the pen go across the board and where it is supposed to be (you'll see the mouse) it will be drawing about an inch to the right.