Latitude XT display problem

First post on the Dell community forums, couldn't find any other information on the Internet regarding my problem. I recently fresh installed Windows 7 since Vista's no longer supported, and everything has been working fine except for the N-trig drivers. With every version of the DuoSense driver I try, I always get an error saying "Fatal error - N-trig hardware was not detected on your system". I've tried every solution on the internet as well as the rollback tool, which says "Driver installation failed". I also tried installing a 64-bit version of Windows 7, however I received the same results as the 32-bit version. It got to a point where I downgraded back to Vista to see if the display worked under that, and it doesn't. Nothing related to N-trig coiuld be found in the device manager either. Could this be a physical problem with my machine? Any help would be massively appreciated.