sorry never heard about this before, one tips from me:
keep your nativirus updated.

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You are right, use Norton anti virus and update every month.

I am not sure if they are dangerous or not .. but you should install an antivirus (kaspersky I recommend or nod32) and delete those trojans

Trojan is a dangerous virus, it can take our secret code and tell hacker how to com to acc e-gold.

i have them alot when browsering but my antivires detict it just when it get down and elete it
by the way my antivires is symantec

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i think trojan not in "high risk" but you should immedietly remove them, you don't have any idea what they took from your pc...

Install Zone Alarm(Will help you block all the spyware and trojan). And also install an antivirus program like AVG or Norton. Then scan and update frequently. This will prevent trojan and spyware.