It is recommended that you close all other programs during a install but I wouldn't worry so much about your comcast connection. I would install the AVG and if you need to uninstall the previous version it will usually tell you. You probably dont need to unless you are going from a free version to a paid version or something like that. Welcome to the site, haven't seen you before. Hope you like it.
I am legit, my friend is not. Its pretty easy to dl without the validation.
http://www.ghacks.net/2006/10/31/install-windows-media-player-11-without-wga-check/
Here is a story from Digg.com about it.
There are several other ways to do it, but this story was on digg.com so I felt safe posting it here.
Calm down there a lil boss, we all find raging pedophiles just as funny as you. :haha: Na that show is funny, in a scary way. I laughed so hard I peed when they busted the same guy under the same screen name TWICE within like 3 days. Dumb shit.