I have no idea about that.... My suggestion to you would be to do ONE of the following to disconnect from the internet...
1. Shut down or hibrinate the PC
2. Unplug the network cable from the back of the PC
3. Disable the network connection from the computer
4. If you have a router between the router & modem, unplug the network cable from the WAN port of the router.
Is this just a home PC, or is this for a business? If it is a home PC, and you aren't using any P2P software, you should be fine. My computer is left on 24x7, and always connected to my network... since last July. I have not had 1 security issue.. I have an nVidia hardware firewall on my motherboard, and I also use McAfee enterprise edition for virus scanning... not 1 problem.