Unplugging my PC Part Two

[smurfchops]

Hi, further to my thread below :

http://www.theanswerb...y/Question977126.html

I still haven't plucked up the courage to switch off my PC in case something goes wrong. However I have Microsoft Security Essentials on both my PC and my laptop. When the PC needs a scan or an update, I can't use the internet on the laptop, I get no signal. The laptop works fine when I have done a scan on the PC and kept it up to date. Does this mean I have to keep the PC plugged in, so I can use the laptop? are they connected in some way ?