Adware:Adware (or spyware) is a small program that is designed to show advertisements (in various form and degrees of intrusiveness) on your computer. It often reports personal information back to its owners. As a result your sense of privacy can be violated.
SpyDefender Pro is another fake anti-spyware application that promises to remove any threat from your computer but in reality is not going to clean it from spyware but might actually expose you to more security threats. SpyDefender Pro tries to trick the user into purchasing the full version of the program by the intentional use of false positives, as well as through false pop-ups and "system alerts," claiming that your PC is infected with dangerous parasites. SpyDefender Pro may also download and install extra spyware programs and Trojans and this is a serious threat to the security of your personal and financial data.
Technical details (How to remove SpyDefender Pro(pop up))