I have got this printer working on my windows 7 machine...
It must be noted that mine is a 64x windows 7 o/s
I downloaded the Vista x64 Driver and installed it,
Then clicked on "Start" (bottom left button) > "Devices and Printers" > Right click on the printer in question (in this case Lexmark x215) > Click on "Printer Properties" > Then click on the "Ports" tab at the top and change the port from LPT1 to USB001 (Virtual Printer Port for USB) > Click apply and the printer should start spooling... (Note: I did not plug the USB cable into the comuter untill all of the above was finished)
Hopoe this help you guys and gals