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Lexmark X3650 Driver (2000/XP/Vista) (480)
Lexmark X3650 Driver (XP/Vista-64bit) (213)
Lexmark X3650 Driver (Windows 7) (292)
Lexmark X3650 Driver (Windows 7-64bit) (230)
From this page as a free Lexmark X3650 download. (32bit and 64bit)
