The most current drivers for the Epson R320 and Windows 7 64-bit are available through Windows Update and the Devices and Printers ' Add Printer function.
- Click Start or tap the
key and select Devices and Printers from the right-hand list. When theDevices and Printers windows opens and populates, click Add Printer from the command options across the top.
- When the Add Printer window open, first select Add a local printer. Next select a port and click Next.
- At the next window, first click the Windows Update button and wait a few minutes until the list repopulates itself. It will look like nothing is going on, but it is working. Once the lists have refreshed, select Epson for the manufacturer and Epson Stylus Photo R320 (M) from Printers.
- When you click Next the printer driver should install and you will be left with the final screen where you can run a test print.

Epson Support has the Epson Print CD v2.0, Epson Easy Photo Print v1.51 and Epson EasyPrint v3.10 software for Windows 7 64-bit available for download here. The driver on that page is listed as a Windows XP 64-bit, not Windows 7 64-bit.