Trojans install themselves secretly onto your computer, most often through your downloading a simple email attachment (often .avi, .pif, .exe, and even .jpg files.) Most Trojans are able to gain complete control over your PC after installation. With this control, the Trojan and the hacker behind it may change your system settings, delete important files, steal your passwords, and watch your computer acitivity.

Some Trojans may also fall under the category of spyware. Spyware is any software or malware (”malicious software”) used to spy or track your computer activity. While some spyware is legitimately and intentionally installed by parents or employers to monitor Internet activity on a computer, spyware may be installed maliciously. Often spyware may come bundled with downloads of free software or come in the form of a cookie via a website, and this spyware may track your Internet activity or may steal secret account usernames and passwords, credit card numbers, and other personal and financial information. Methods of Vista Antivirus 2008 and Other Trojans Infection

Most trojans infect your computer by tricking you into running an infected application. This infected application could disguised as a small file, such as a jpeg or other email attachment, or it might be downloaded via a website or FTP.

» Email: Your PC may be infected with a trojan when you download infected email attachments, or sometimes even when you simply open an email. Many trojans exploit security holes in Microsoft Outlook. You may be able to reduce your chances of getting infected by a Trojan by using a spam-blocking software.

» Websites: Your PC may be infected with a trojan when you visit a rogue site. Many trojans exploit security holes in Internet Explorer web browser so that by simply visiting a website you may unknowingly download a Trojan.

» Open ports: If your computer runs programs that provide file-sharing functions - such as AOL Instant Messenger (AIM), MSN Messenger, and more - you may open your computer up to vulnerabilities. Using file sharing through these applications may create a network that gives attackers the opportunity to remotely access your computer.

Vista Antivirus 2008 may have infected your PC by through one of those methods. Trojans are some of the most sophisticated and dangerous type of malware, capable of controlling your system. Because of this, it may be best if Vista Antivirus 2008 and Trojans are removed from your computer immediately.