uhm... I've actually not heard of that program before, so I cannot/will not, in fact, be vouching for it.
It has, in fact, been my experience that OS utilities other than a simple firewall or virus checker are for the most part extremely damaging to your system. Ad Aware is different, and I've seen some popup blockers that are pretty good though, but anythig scan as you guy sets off alarm bells in my head.
One thing about installing, NEVER EVER check teh "always trust content from..." no matter what the company listed is. if this window never pops up, change your IE settings to make it ask.
Safe computing practice will protect you from problems like this. You don't have to change from IE or to a Mac to do it.
Oh, and IE is just fine. I wonder about the complaints I hear about it. "More than 6 windows" is ridiculous. I have an old computer (300 mmx, I think) running WinXP, and on top of all my other programs, i often have as many as 2 dozen browser windows open or more. And it never hurts my performance.