ACprotect (how can i remove this program?)

my friend installed this software because he was asked to when he was installing some softwares in my computer. now when i installed my Photoshop cs3 it will tell you that for you to be able to install PShop cs3,You have to close all browser but my desltop is empty..no browser opened just the installation of PShop cs3..can somebody help me hot to remove this program? i think this is a bot or disguise as 1 but its a malware perhaps.. pls help..

thanks