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.
Trojan.Win32.CP4000 is an imaginary Trojan name used to threaten and trick users into buying the rogue anti-spyware application Files Secure . The user gets infected after downloading the video codec that infects the computer with a nasty Trojan. This Trojan then displays false warning messages stating "Your browser was hijacked by Trojan.Win32.CP4000" and recommends to download the program (most probably Files Secure), which will "remove" this parasite. However, in reality Files Secure will not fix your PC but might actually expose you to more security threats.
Technical details (How to remove Trojan.Win32.CP4000(pop up))