We have received multiple reports from users saying after they updated to 6u7 in Vista, when IE is launched, they receive a security dialog saying the digital signature of ssvagent.exe cannot be verified.

The dialog screenshot is in attachment or here:
http://lila.godel.com/msgfiles/iesjd.jpg

The reports can be found here:
http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=6635144
and here:
http://forums.sun.com/thread.jspa?messageID=10367450
This only affects Vista, however it does not appear to be affecting all Vista machines. We have not yet been able to reproduce this on our test machines. It is not yet clear why it is happening on some Vista machines and not others.