Windows Genuine Advantage Notification is checking if you are running a legit copy of windows on every boot, even though it might have already verified this on the first run. This is an annoying behaviour of WGA Notificiation which can be countered by running this sweet little freeware called Remove WGA.
Remove WGA gives you information if WGA Notification is running on your system and allows you to disable the wga tool from your system. It is also able to run silently on your system and become active when the WGA Notificiation becomes active on your system as well.

Remove WGA
Remove notifications for blocked popups in Opera
Remove DRM from WMV
Dead Link ?
Try the cached version: http://www.firewallleaktester.com.nyud.net:8090/removewga.htm
The link works just fine!
As of this day and time neither of the links work, and the Firwall Leak Test site keeps throwing up a 404
You can simply remove the files from your system too. I found removal instructions here remove genuine advantage
I don´t like the idea that a operating system is checking and phoning home all the time. It´s really a good idea to remove wga asap or make the switch to linux.
bom
want to remove wga