last time, I post messege here, asking for worm virus, finally, we fix it, we got high speed again, but we still have the problem. Most clients use win2k pro 1. in COMMAND, we use ping yahoo.com, got messege: Request timed out. Reply from 67.69.21.129:Destination net unreachable. Request timed out. Reply from 67.69.21.129: Destination net unreachable. and I ask my friend that's cuz network too many trafic, it must some virus or worms. But we have use Norton lastest ver check all clients and server, there are no more worms and virus. Anyone knows wut kind of virus can cause network lag and busy. 2. we have Couter-strike server, all our client can go to internet, and fast. but if outside computer connect to our server, it's so lag, I think it's the same with problem NO.1 Anyone pro on virus plz help me!

The latest Nachi worm creates net congestion by sending thousands of explorer ping packets which consumes a large amount of bandwidth , it only takes 2 or 3 still infected machines on a subnet to bring it to it's knees.

I know this virus, Also Known As: W32/Welchia.worm10240 [AhnLab], W32/Nachi.worm [McAfee], WORM_MSBLAST.D [Trend], Lovsan.D [F-Secure], W32/Nachi-A [Sophos], Win32.Nachi.A [CA], Worm.Win32.Welchia [KAV]. so u mean, we still have some clients have this virus right? hwo can I 100% kill it??