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.
TrojanProxy.Wopla.ag is a spyware Trojan that gets into your computer through browser security exploits or under dubious circumstances without your consent. Once infected with TrojanProxy.Wopla.ag, your computer becomes a proxy server that can be used by the remote hacker to send spam emails and perform other nasty activities.
Technical details (How to remove TrojanProxy.Wopla.ag(pop up))