Malware Bytes: download and install
The manufacturer of Malwarebytes' Anti-Malware application offers two versions: The "free" version that does not require a fee (i.e., freeware) and the "full" version that requires a fee. This application can be installed on a Windows XP, Windows Vista, or Windows 7 computer. The full version of Anti-Malware provides a realtime protection module. You should scan your computer using Malwarebytes' Anti-Malware at least once a week.
Malwarebytes' Anti-Malware already installed on an infected computer