my computer says I was infected with an unknown trojan?

Since you've only had your computer for 2 weeks I recommend using System Restore to restore it to before it had this problem.

heres how to do it in Vista

http://www.bleepingcomputer.com/tutorials/tutorial...

Also since you've only had your computer for 2 weeks I recommend uninstalling Nortons as it's only a trial version anyway, and beyond not being highly rated at catching stuff, it will slow your system to a crawl.

To keep your computer clean I recommend Kaspersky Download a free trial here, and buy it if you can afford to, it's good

If you can't afford it

These 3 free tools will help you keep your computer clean ~ Patrick

Check out the video review below for the best free Antivirus program

I recommend these 3 FREE top rated Programs to clean up and protect your system

~ Pat

The Top Rated Free Antivirus Program researched from those who test Antivirus programs (av comparatives, virus.gr, and other reviews including this video review) http://www.youtube.com/watch?v=KhXZo3dHulc is

Avira Antivir http://www.download.com/Avira-AntiVir-PersonalEdit...

Today you are in more danger from Spyware I Download, Install, Update and Run SuperAntiSpyware

http://www.download.com/SUPERAntiSpyware-Free-Edit...

( I used this to remove spyware and Trojans from a laptop that adaware would only detect but not get rid of ) It detected and removed everything

Download and Run Advanced Windows Care Personal

http://www.download.com/Advanced-WindowsCare-Perso... this will tune up your system and show you what starts at bootup, and allow you to edit this.

(uncheck the Registry tab, but check the Spyware, Security and startup tabs and see what is starting up and disable harmful items.

First of all, don't download what it suggests...

I'm assuming that you are either still within the Norton Trial Period, or that you bought it, so uninstall Bitdefender as you should only have ONE antivirus program on your computer. If you are just on the trial period of Norton, and don't intend to purchase it when the trial ends, then uninstall it now, and install AVG in its place. For these uninstallations, use RevoUninstaller.

Then, do the following:

Step 1: Make sure that your antivirus program is up to date.

Step 2: Visit the Google Pack website, and use it to download Spyware Doctor.

Step 3: Download and install ThreatFire.

Step 4: Make sure to use Mozilla's Firefox from here on out. Also, install the Adblock Plus add-on for it.

Step 5: Make sure that you have a firewall program on your computer. If you don't, install Comodo.

This is just a quick summary of what you should do. For other recommended programs, and their optimal settings, visit my guide on the matter.

If you need any extra help, feel free to IM me on Yahoo Messenger.

You got hijacked. The message you got was placed onto your computer by you visiting a site that had the malware waiting in the background. First, roll your computer back as far as you can using a restore point dated before the first time you started getting these messages. Then once this is done, go out and get a good piece of security software and install it on your system. My main recommendation is TrendMicro's Internet Security suite, the 2nd one that's really good is Kaspersky.

“Your computer was infected by Unknown Trojan” is a fake popup message generated by rogue anti-spyware programs (IEDefender, FilesSecure). Some real trojan horses (Trojan.Zlob, Trojan.Downloader) will display excessive popup advertisements that your computer was infected by unknown trojan to tirck users to purchase commercial versions of promoted rogues. Unknown trojan message can slow your browser and cause serious system errors.

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manual removal instructions:

DON'T DO IT. It tells you that you have a trojan, and tells you to download that thing. But when you download it, it downloads a real trojan, and then you have to pay money for a fix.

Download a legit spyware system.

do not acquire or deploy something. perhaps you have visited a rogue website, and those popups that asserts you're contaminated is largely a flash report (SWF) besides the incontrovertible fact that it is aggressive and could shop you redirect to a distinctive sites. those rogues and spywares demands instruction manual installation, so it propose, it is going to not be able to deploy with the help of in simple terms traveling the positioning. i propose you to terminate your browser (CTRL+ALT+DEL then locate your browser IE, Opera or Firefox and correct click and delete it). additionally, delete those cache, non everlasting data and cookies.

go to http://free.grisoft.com/ Download avg free edition. Best anti virus I ever had.

sounds like someone is downloading "no-no's" on the computer. shame on you. you have spyware and ataware on your computer now. you need spyware search and destroy software.