talking about lineage 2 and viruses.... i have 2 things to say....
1- oficial itself have a virus called themida... its not a virus in really... its safe, so all good antivirus program may detecte the L2.exe in system folder as a, at least, suspect program...
2- BFD server uses a patch with a file called ""msxml4b.dll" wich is infected with a trojan called CI.A... well, i put it in exception list of my antivirus program and all is ok...
antivirus program i recomend: panda antivirus (global protection 2011, i use it)
i dont recomend: avg