Adware.W32.ExpDwnldr is an Adware Trojan program that may secretly install onto your machine and will display fake security messages stating that your computer is infected with spyware threats. Adware.W32.ExpDwnldr will generate the message similar to the one stating: 'Warning! Spyware threat! Your system security level is too low. Default security software is unable to protect your private data.' The notification will also claim that your computer is infected with Adware.W32.ExpDwnldr and other threats and will urge to purchase several promoted antivirus and anti-spyware applications, including WinAntiVirus, WinAntiSpyware and SystemDoctor. Adware.W32.ExpDwnldr interferes with your security and privacy and shouldn"t be trusted. (via)