I used this for years & never got infected. I then switched to Kaspersky Free Antivirus. Everything was fine for a few months when I noticed I was getting strange results from internet searches also defrag was not getting 100% defrag like usual. Ran Kaspersky & everything was fine & rootkit scans were fine as well. I exited Kaspersky & downloaded Qihoo 360 Total Security Essentials. It found the Rampant Critter really fast!!! Searches & Defrag are back to normal. I hope this helps someone who is infected. Quihoo Antivirus Products saved the day for me.