We really need more information than this. How old is the printer, and is it a printer or printer/scanner combo? I know some units don't have the latest drivers available. Even my couple-month old HP printer scanner doesn't have full support in 64-bit operating systems (at least since I first installed it).
Honestly, there's probably not much that can be done... If Epson doesn't have drivers that support Windows 7 or 64-bit operating systems, then it's simply not supported. There may be alternative drivers that'd work with limited functionality or beta drivers around, but that's about it. If it is just a printer, I'd say look into a new one. Some printers are so cheap, it's almost as beneficial to buy new printers each time rather than getting ink cartridges!