I noticed after a virus hit one of my systems in WIN7 x64 that the firewall was completely down and then after I fixed it and applied combofix, the system's networking was like swiss cheese. Combofix is a LAST resort. I tried os x and win7 networking, even inter win7 networking, and no go unless I entered the network name for the computer. I thought about a simple PING test and that didn't even work. Ping must have been disabled, and I found this netsh command to restore it.
Code: Select all
netsh advfirewall firewall add rule name="ICMP Allow incoming V4 echo request" protocol=icmpv4:8,any dir=in action=allow