Ares Ultra Uninstall?

I installed the free version of Ares Ultra on my Dell Dimension E521 PC, then because i din't like it I uninstalled it through the add or remove programs. It said some programs would have to be uninstalled manually so I searched them and removed them. Now when I'm listening to online radio stations like www.di.fm (which i love) and i click on the type of music i want to listen to a box comes up each time saying it's an Ares Ultra file and whether I want to open or save it to my pc. This NEVER happened before I installed the Ares Ultra. I just used to click on the music and Windows Media Player would begin playing it. Why is this happening if the program is uninstalled and is there any way to get it back like it was before?