unlucky scatter, it's a brand new worm discovered today
mcafee should have a fix by now :/
but to be safe you can block port 3127 (TCP)
here is the manual way to remove it
Click Start, and then click Run. (The Run dialog box appears.)
Type regedit
Then click OK. (The Registry Editor opens.)
Navigate to the key:
HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\Curr entVersion\Run
In the right pane, delete the value:
"KAV"="%Windir%\msbssc.exe"
Exit the Registry Editor.
of course it's much better to let mcafee deal with it if your not sure about messign with the registry