I have an Epson D78 stylus and I use it mainly on Windows 7 64-bit. I downloaded the driver from the Epson support site for my Windows 7 64 bit version and it's up to date.
I also installed Ubuntu on my computer, a 32bit version where the driver was installed automatically, so I didn't do anything.
Using Windows 7 to print I often have a lot of problems (80% of times), e.g. a lot of ink lost and the paper often gets dirty. When I use my Ubuntu version to print, everything is perfect, not even a line out of place, not a dirty pixel.
I also noticed that the printing speed is different from one OS to another, being slower on Ubuntu.
Why is that happening? Shouldn't be better on Windows, as the driver was actually designed to be used on Windows?