Lexmark X6650 All-in-one Printer Driver
Windows 2000
Windows XP
Windows Vista
Windows 7
Lexmark X6650 Driver (2000/XP/Vista) (50)
Lexmark X6650 Driver (XP/Vista-64bit) (25)
Lexmark X6650 Driver (Windows 7) (16)
Lexmark X6650 Driver (Windows 7-64bit) (13)
From this page as a free Lexmark X6650 download. (32bit and 64bit)