Been traveling accross the USA for the last few months, and still on my way... but here's something I like to mention. Yesterday I got a notification of a new version of Microsoft Security Essentials, MSE. Tried to upgrade within the program but got an error message. Send an email to Support and they replied within 24 hours. They even called me later. But just after I sent the email Microsoft Update kicked in and showed it as a "critical" update. Installing the new version through MS Update was no problem. Nowe I have the following version installed:
Microsoft Security Essentials Version: 1.0.1963.0
Antimalware Client Version: 2.1.6805.0
Engine Version: 1.1.5902.0
Antivirus definitions: 1.85.1058.0
Antispyware definitions: 1.85.1058.0
If you also get an error message try Microsoft Update website or "Windows Update" in Vista or Windows 7. Now MSE is running nicely on this laptop.