The Trojan horse is the computer program which can harmful your computer by the getting of the other viruses to your computer. The Trojans are not the virus. They can not replicate themselves like the virus. The Trojan will be tricky.



The example of the trojan's work are:

- They will make the pop-up windows when you are online. They will make you annoyed. But if you have the activities with the pop-up windows, sometime they will download the virus to your computer.

- When you receive the emails with the subjects like ?The program can kill the new virus on your computer, download now?, you should know that is not safe for your computer. If you download or run this program, It will harmful your computer.

- They will change your desktop setting or some program's setting. This is not the serious problem if you can change them back.

- They will erase, overwrite or steal your important data such as banking account and credit card number.

- They will spread the virus, malware or adware in your computer. The important purpose of this method is stealing your data. There are the easy methods like log-keystrokes and putting the backdoor.

The easy ways to protect your computer from the Trojan are:

- You should be not to download or save anything to your computer if you are not 100 percent sure of its source especially emails with attachment, instant massaging and unconfident websites.

- You should update your operating system especially Microsoft window to the up-to-date version.

- Anti-virus software is the important point to get. You should have at least one program for the protection and always keep it up-to-date. It will kill the new virus in your computer. The real time anti-virus software is the necessary for you.

- You should activate the firewall protection your computer. It can block the in-coming or out-going programs that can harmful your computer.

If you are following these methods, it will decrease the chance to infection and increase your computer security.

Spyware and Adware are the other dangerous programs for your computer. But now, the online advertisements through these tools have become the 2,000,000 USD. This is the aggressive advertising and spying tactics. There are a lot of anti-spyware and anti-adware such as Counter Spy, Ad-Aware, Spyware sweeper and more.

Their basic features of these programs are:

- Detect and remove spyware/adware in your computer.

- Real-time protection.

- Detection and removal of tracking cookies.

- History cleaner.

- Secure file eraser: the tools that can completely remove your deleted files in your computer.

- PC Explorer: the tools that can explorer to the unaccess area in your computer such as start up program, active-X program and system files.

- Support more than one operating system such as window 98, window ME, Window XP, Linux and Window NT.

- Online update: For update program to the new engine and new spyware database.