lately ive been hearing ring tones or dialing sounds coming from my computer tower and when i ctrl-alt-del i find that rnaap is present in my list of running programs.

i have a cable modem and rnaap is for dialup. is it due to spyware, a virus or what?

how did it get there? i never encountered this problem before. why does it keep returning. can i get rid of it and if so how?