I had this problem recently. Apparently (and I don't
really know why) I had to reregister wintrust.dll.
Frantic searching on the database led me to this page...
http://support.dell.com/us/en/kb/document.asp?dn=1075765
There are loads of other, simpler possibilities, but as
you say it's suddenly happened (like it did with me) I
imagine all the other possibilities are covered.
-----Original Message-----
suddenly we are unable to access secure sites frome our
pc. I have checked the security settings and they seem
normal perhaps I am missing something. My server
suggested a firewall problem but I cant seem to locate
that either.