Trojans are malicious computer programs that pretend to perform a desirable function but in fact perform some other malicious functions. A Trojan horse program is largely a delivery vehicle designed to infect your machine.

Computer Trojans can cause serious problems for your PC and result into one the following:

• Files and websites opening on their own
• Overall slowdown
• Changes in your homepage that is not been introduced by you
• Pop –up ads and unwanted tool bars
• System shutting down on its own
• You are not able to see Windows startup button
• You are not able to use task manager as Control + Alt+ Delete does not work

You can take following steps to remove computer Trojans:

Make a detailed note of all the problems encountered by you. Using a credible Trojan/Spyware remover scan your system and find out what Trojans are there on your PC. Downloading Trojan remover may not help as these programs often contain computer Trojans themselves.