Viruses on Computer - Norton 2008 not detecting them

Hello,

 

I Need some help urgently! I have four (4) Trojan Horses: Svnmgr, Wingpr, Sqcmgr, and Symnotifywnd on my computer and my Norton 2008 is not detecting them therefore, they cannot be dealt with. I keep deleting them but they keep on coming back. How can I deal with this? FYI my subscribtion has another 167 days so it has not expire.

 

Thanks for any help