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.
SpyiBlock is a rogue anti-spyware program that is often downloaded and installed without user knowledge or consent by a Trojan or through browser security holes. SpyiBlock will also display notifications of imaginary security risks in its attempts to get the user to purchase the full version.
Technical details (How to remove SpyiBlock(pop up))