Is there a Win7 64 bits driver for a Stylus 870 Epson? Thanks
Epson only directly provides drivers for this printer up to Windows XP 32-bit, which are found HERE
You might be able to locate them elsewhere by googling it but they are likely to be 3rd party drivers and they aren't always guaranteed to function appropriately.
You may also be able to install them using Compatibility Mode by right clicking the .exe file and choosing Properties and then the Compatibility tab.