Hmm, I would imagine they'd be different. Have you looked at the MS site to see if it explains what the updates are? I know for each update it will allow the user to click a link that will take the user to another place to read a bulletin. Perhaps one of our resident computer gurus can elaborate on this?
After googling the number, the MS pages that come up, just give me some vague computer related jargon. I don't if I'm doing the search wrong, or if I'm not following the right links.
On the topic of AV, many people rave about Kaspersky. In my personal experience, shops with Kaspersky scan my thumbdrive, and find nothing. I take it home, and NOD32 tells me they have given me a virus.
Here's why I love Eset products:
www.eset.com/kh/home/whyeset/compare/
Someone recommended eset as well. Maybe I should consider using it.