You can't install without software and I did post a link for you to go to and download your software. Make sure that is the correct printer X75 they have different models but it sounds like yours is a X75 all in one. The link I posted is from Lexmark site so you should be good to go by just downloading the drivers and software and install. Just click on the operating system you have and the download process should begin.
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It depends on your operating system. Your printer and drivers may already be stored in your operating system - so try using the "Add a printer" first. Or go to the makers website and download the software, if available.