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.Dialer.yz is a vile Trojan dialer application. Trojan.Dialer.yz is often brought into your computer via browser security holes or bundled with various malware programs. After Trojan.Dialer.yz is executed, it will disconnect you from your dial-up ISP and reconnect you to an expensive phone number. Such actions will result in an enormous phone bill.
Technical details (How to remove Trojan.Dialer.yz(pop up))