Epson never wrote any Windows 7 driver for this printer model (and has no plans to). Your only hope of getting it to work in Windows 7 is if Microsoft included a basic printer driver with the OS. Use the Add Printer Wizard and if the LX300 is not listed, try experimenting with models that are as close to LX300 as possible. You should find one that performs satisfactorily. No disk is needed since the files required will be already present on the hard drive.