How to I adjust the settings of my tablet to work more efficiently in Photoshop?

I'm using Photoshop 7.0 (don't ask me to update, I can't afford to), and a Trust TB-2100 wireless tablet. When I draw lines using the brush or pencil tool, the lines are always too thin to see. I know it's drawing something because if I make the brush huge (like 300px) it shows up very faintly. The first couple of times I used it, it gave me the right line thickness but now it's barely visible. How do I make it draw more reasonably sized lines?
 
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