Check out the LockDown Series under Computer Protection or more info on protecting yourself from Trojans.
Editor: Waskilly Wabbit - 08/20/08
Make sure when downloading files that you are positive it is from a trusted source. Once theyve snuck their way into your computer they can infect your hard drive, they can possibly wipe out your disk, and whats worse is they can make their way from your computer to others and infect the World Wide Web.
The best way to avoid this from happening would be to not download anything, but thats next to impossible, because who doesnt like shareware programs, besides Metallica, but what you can do is get a good anti virus program. The best anti-virus program on the web is AVG anti-virus, and whats better is its completely free. The program will protect your computer from Trojans and viruss, and if you were to get any you can store them in a vault and erase the from your computer completely. Go to the link provided below, scroll down and click the Get AVG Free link for whatever operating system your computer runs then download the program and then upgrade to the latest version.