I'm glad that worked, but I don't know why it did. It is quite possible,
given what I've been reading in the press, that there have been changes to
the functionality of this feature with build .509.
I recommend AVG. Except for some occasional issues with updating, and some
of their default settings which I see as advertising and not helping secure
the user, particularly, I like the product and use it on machines for which
their free version licensing is appropriate.
Judging from the announcements at the RSA conference, Microsoft will have an
application later this year which will incorporate antivirus functionality.
I don't know what will differentiate it from the herd, but I suspect it will
be different, and am waiting with 'bated breath.