If at a certain time you suspect that your computer is being attacked, you can interrupt all network connections temporarily, including the Internet connection.
Right-click the Panda Antivirus Pro 2010 icon on the system tray (the bear icon by the computer clock).
Click Block network connections.
When you do it, the option changes to Unblock network connections. If you click this option, it will allow you to re-establish all network communications.