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-Proxy.Wintu.a is a malicious Trojan program that compromises computer by creating a proxy server on your computer. This allows a remote attacker to route HTTP traffic through the infected computer. An attacker can use your computer to send massive amounts of spam email, host phishing sites, and conduct other illegal activities. This Trojan is known to seriously degrade your PC and Internet performance.
Technical details (How to remove Trojan-Proxy.Wintu.a(pop up))