Windows 2000
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Lexmark X6650 Driver (2000/XP/Vista) (162)
Lexmark X6650 Driver (XP/Vista-64bit) (91)
Lexmark X6650 Driver (Windows 7) (71)
Lexmark X6650 Driver (Windows 7-64bit) (66)
From this page as a free Lexmark X6650 download. (32bit and 64bit)
