Where did you get the .exe file? Was it from here or some place else? If it came from another site, it might be possible that someone got the source and added some adware and compiled it to include the offending program, but it didn't come from here. Or maybe the porn movie that downloaded off of kaza that you watched had something embeded in it. Just something to think about.
You have to be careful where you download open source stuff. I've gotten stuff I thought was from SourceForge but was actually recompiled as "shareware" by some --please stay polite-- who wanted money for it after the trial period.