NSIS:Adware is a threat detected by either Microsoft Security Essentials, Windows Defender for Windows 8 or Microsoft Safety Scanner. This NSIS:Adware threat is classified as PUP a Potentially Unwanted Program by Microsoft because it inflicts and acts as a malicious threat into your computer system. NSIS:Adware is not a virus but it does act like one. NSIS:Adware is adware which is bundled using custom installers and dropped on your computer during the installation process. Most users have no idea how this NSIS:Adware threat is installed on there computer and what it is, until Microsoft Security Essentials, Windows Defender for Windows 8 or Microsoft Safety Scanner detects it as a malicious threat or virus. Follow our instruction to remove this NSIS:Adware threat from your computer.