Firmware. Note: It is highly recommended to consult with your Network or System Administrator before performing any software (firmware) update. Some updates may cause the machine to become non-compliant and cease to work as intended with the environment in which it is installed. Date: 7 Mar, 2007; Version: 1.221.7. read more
They may not support Windows 7 but they do offer a Windows vista driver download. I'm not familiar with Xerox machines but it's probably worth trying the vista drivers. Printer drivers are funny and sometimes will only work for specific platforms. You could try asking Xerox support. read more