Genius Tablet's pressure sensitivity not working in Blender.

Hello everyone and sorry my bad English.

My tablet (Genius G-Pen 4500) doesn’t have pressure sensitivity on either Texture Paint and Sculpt Mode in Blender. It just functions as a mouse.
However, It works on Gimp and ZBrush very well.
Is it needed to configure some settings in Blender to allow it sense my tablet?

I am working on Windows XP system.

Okay, after some searching it seems no one working with G-Pen and Windows when using Blender.
After all I found a script called “PyTablet.dll” maybe a solution, but the download link of the script on Blender Wiki is dead.
It is kinda frustrating to solve many technical problems on Blender despite of it’s power.