I have McAfee virus protection. There is a "Lockdown Firewall"
option that states it "instantly blocks all inbound and outbound network traffic between your computer and the Internet. It stops all remote connections from accessing your computer and blocks all programs on your computer from accessing the Internet."

There is a button to click on for "lockdown". Should I activate this? If I do how do I deactivate it once the threat has passed? I don't want to do anything that's going to be hard to reverse.