[Hayashi]

I got hit by this virus/worm a few weeks ago, but managed to clean it.
This virus is nasty - if it infects your PC, it will disable your anti-virus program.
I posted here for help at the time, asking for assistance as I had some problems running Norton Utlities. That was because (unknown to me at the time) the virus had already fouled up my Norton by fiddling with the Windows registry.
I tried reinstalling Norton but of course that didn't work. Eventually I managed to clean the virus that weekend, and things are ok now.
I suspected a virus as I frequently watch the incoming/ougoing count of bytes received/sent. When my PC was infected, the count going out was abnormally high.
For those of you whose antivirus programs have been hit, Symantec (the makers of NAV) have a tool you can download to remove the virus. Fortunately removal is pretty easy.