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.
WinAntispyware2008 is a rogue anti-spyware application. WinAntispyware2008 is often downloaded and installed by a Trojan, through browser security holes, or via other unconventional and unethical mechanisms. Once installed, WinAntispyware2008 will display notifications of imaginary security and privacy risks in its attempts to get the user to purchase the full version and may generate system slowdown and instability. This program can be extremely difficult to manually remove.
Technical details (How to remove WinAntispyware2008 (pop up))