hmmm...still wonder if there's something malicious. I haven't had any problems with QB.
Another thing you could try is an online scanner as well. Either of these two are good. I've used them both at different times
http://www.eset.com/online-scanner
http://housecall.trendmicro.com/au/
They both will load something onto your computer (if I remember correctly) but it shouldn't interfere with anything.
Another thing I've used is Trojanhunter..but it's a paid one. You could download the trial and see if it finds anything though. Just google trojanhunter