QTR-Quadtone RIP

I uninstalled Quadtone RIP, but when I try to print an image using the Epson drivers, the 
Quadtone RIP features still appear: I get a warning that no Quadtone RIP has been selected, 
and that image quality cannot be guaranteed.

Using Spotlight, I performed a search of the computer's hard drive, and can find nothing with 
the word quad or quadtone or RIP. Even so, the uninstall process must have left some 
remnants somewhere... where ?

Many thanks !