What is the Trojan:Win32/Sirefef.AB? and How to remove it?

What is the Trojan:Win32/Sirefef.AB?
Trojan:Win32/Sirefef.AB has recently been introduced in the market as another fake antivirus program. As of to date it has infected a lot of computers all over the world. If the program gets into a computer system, it can cause a lot of problems. A range of problems that is associated with the product include difficulty to load the Windows Features and inaccessibility of different programs. In some cases, the user may not even be able to access the Task Manager. However, this is on a case to case basis. Further, the program not only creates a lot of problems for the computer but it can also steal personal information and very important files. Predominantly, the program also tries to fool the user into thinking that he/she should buy the product's upgrade to be able to use the program's functionality. The application should be removed from the system immediately. The following instructions will provide a step by step tutorial on how to remove Trojan:Win32/Sirefef.AB.