There are many with your problem.
The problem is the version .....if it was 3.6 it works normal, but the 4.1 uses diferent drives.
I have a "SIM2.0.1_76D_ICVS Image 04.02.2011_GP3 .nfi" that my friend worked on and the wireless pen is working very well.
Is you want to test, please tell and i'l put the image in an upload center.