I also have this problem. I'm running Windows 7, 32 bit system and have a Lexmark 5470 printer. Can you tell me which drivers I need.What is the exact model number of your Lexmark 5400 Series printer(e.g. Lexmark X5410, Lexmark X5450, Lexmark X5490, etc.)? What is your Windows 7 running on, 32-bit or 64-bit? To check, click on Windows logo Start menu > right click on Computer > Properties. With these info, I should be able to lead you straight to the driver itself for you to download.
Welcome! Which model in the 5400 series are you wanting a driver for?
I've had a quick look on their site and it looks like there are Windows 7 drivers now. I just picked a random printer in the 5400 series as all of the drivers are the same:
64 bit 5400 series for Windows 7:
32 bit 5400 series for Windows 7:
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