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.
FestPlattenCleaner is a rogue anti-spyware application. FestPlattenCleaner is often downloaded and installed by a Trojan, through browser security holes, or via other unconventional and unethical mechanisms. Once installed, FestPlattenCleaner 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 FestPlattenCleaner(pop up))