is no longer recommending
Spybot S&D or Ad-Aware due to poor testing results. See here
- (scroll down and read under Freeware Antispyware Products)
Further, most people don't understand Spybot's TeaTimer
or how to use it and that feature can cause more problems than it's worth. TeaTimer monitors changes to certain critical keys in Windows registry
but does not indicate if the change is normal or a modification made by a malware infection. The user must have an understanding of the registry and how TeaTimer works in order to make informed decisions to allow or deny the detected changes. Additionally, TeaTimer may conflict with other security tools which do a much better job of protecting your computer and even prevent disinfection of malware by those tools.
More effective alternatives are Malwarebytes Anti-Malware
and SUPERAntiSpyware Free