Trojan Killer is a well-known piece of software that's been designed to delete various parts of your computer in order to make it run much smoother and without errors. It's primarily designed to attack & remove the various elements of the "Internet Explorer" program, as well as a large number of files & settings which are required for the operation of Windows. To clean an affected PC, see if you can find a reliable free tool that can eliminate all the parts of the infection from your system; if not, then you should at least look to buy Trojan Killer. This program has been created by a large software company called Gridinsoft, who have developed a legitimate application (called "TSC") that's able to get rid of the most common parts of the infection from your computer.
This software is available through a website (at the bottom of this article), which will normally lead you to a link to a "free" scan. Once you have found the tool that you want to use, just download it, install it and then let it perform a "deep scan" on your computer - where it will then scan through all the files of your computer and clean out any of the infected elements that it finds. There's a small button on the software that you'll need to click before it starts scanning - which will stop your PC from being damaged further. This deep scan is basically what will stop your computer from ever getting infected again, although it will require the completion of a full scan in order to completely remove all the parts of the Trojans that are infecting your PC.
You might also be interested to know that Trojan Killer will perform a "registry repair" on your computer if you're trying to get rid of it - and to do so, you need to first use a "registry cleaner" to scan through your computer and fix the various settings that your PC needs to run. The registry is a central database that Windows uses to keep all the settings and options that your computer requires to run, and is a vital part of Windows. Unfortunately, the registry database is prone to becoming damaged and is one of the most common causes of damage for Windows PCs. To ensure that your computer stays as fast and smooth as possible, it's recommended that you use a registry cleaner to scan through your system and fix the various errors that your PC might have.