( ....I have dowloaded and installed the latest
drivers for the printer (Lexmark X1150). There has been an updated XP
driver which I just installed on the desktop. The printer does not have a windows 7
driver, but it says to use the vista
driver, so that is the driver I installed on the windows 7 laptop. I can access the printer and get it to work if I plug it directly into the windows 7 machine (so I assume that means the driver works). )
ok... above is where you went wrong IMO.....
1. just uninstall any
drivers to do with the printer on Windows 7 machine first and reboot.
2. now try to add the printer again normal way as you did before.
3. windows will ask that a driver is needed and it will install that driver without you taking any part in this.
4. You should get a result now.
Good luck.