Seems to be related to roxio software. Do you have that?
http://support.dell.com/support/topics/global.aspx/support/dsn/en/document?c=us&docid=098D85DDBAC783B2E0401E0A55175844&l=en&s=gen is a link from dell about, well, not your problem, but mentioning sonic. I don't see any reasons to update this software if you use it.
Did you already have a look in the software to see if there's some option to turn off automatic updates?
I've got a Dell XPS 400 running XP Media Ctr Edition and I.E.7 plus the full McAfee package.
From time to time I've gotten popups telling me there are updates available but I've ignored them and just continued on.
This morning I got another and it took me to a Control Center, (????), or some such and I decided to download the latest update. I have no idea what it was but it indicated it could be associated with "Sonic". I don't know what that is either.
There are three more updates available ranging in size from 9 to 30+ MB. I left them as is.
Can someone tell me what this feature is all about?