You can do this by
going to start, then control panel, then choosing network
and internet
connections, then choose network connections. Right
click on the connection
you are using to get online, then choose properties. On
the advanced tab
put a check in the box underneath internet connection
firewall. After that,
be sure to get the critical updates from http://v4.windowsupdate.microsoft.com. Also you may want
to run an updated
virus scan to remove the virus, or get a removal tool
from www.sarc.com for
W32.Blaster.