Complete removal of PHP:Decode-DP[Trj] is very important but this should be in time because any wait causes to damage many of your installed programs and crucial software application. This Trojan infection is designed by potential cyber criminals and after getting inside, it starts modifying installed browsers, application, software, registries and even OS components. This situation is ultimately weird for users and they cannot able to work with their own PC due to sluggish behavior and unwanted redirections to third party location. Hence, removal of PHP:Decode-DP[Trj] and its entire supporting components either with manual method or automatic free scanner tool given below.
http://www.pcinfectionremovalguide.net/download-spyhunter