How can I defend my computer for trojan.exploit?

I'm constantly gbeing atacked with Trojan.exploit virus whenever I connect to the internet. I have a broadband connection. Sometimes it works fine, but other times, as I open a site, the page does not open properly and I get a virus notification. I'm using Symantec antivirus and it duly quarentines the virus and my system also remains clean. But, the problem reoccurs as I tried to log in again. This means that my system is not infected, but the virus is coming somewhere from outside, probably some other user's system who is having the same internet connection that I have. My service providers are almost at a loss as to what to do.

Any help from here therefore would be of great relief. I have tried turning off system restore, as someone has suggested for a previous question of a similar nature, but for no avail. Please let me know if there is any program I can get for free, or any other step I can take.

How can I defend my computer for trojan.exploit?internet

Try using this:

http://www.javacoolsoftware.com/spywareg...

%26 Do a free online scan here (with system restore off)

http://www.bitdefender.com/scan8/ie.html

How can I defend my computer for trojan.exploit?network

I use nothing but the Yahoo online protection software. It alerts you immediately if your computer has been attacked with a virus, and it will either remove it for you, or it will prompt you if you have to remove it manually.