Hi guys. Everytime I launch Steam and Launch Day of Defeat or Counterstrike my Norton pops up and says that it has "Block Trojan Horse, Your Computer is Safe". At the same time, the game says its unavailable. In my brothers room next door he is able to access the game and we are on the same network, but he has no Norton. I was guessing the prob was Norton, but then I did a Spyhunter 2.9 scan and found I do infact have Trojan.Vundo on my PC. The wierd thing is that I have experienced no Virus-symtoms and no popups or lag or antyhing. So the question I have is, why all the sudden is Norton thinking DoD and CS are Trojans and why hasn't my Up-to-date norton or Ad-Aware not picked up this Trojan or is this Trojan even the one Norton is detecting? Thanks to all in advance.

My OS is WinXP w/SP2