Look at this kb from MS.
http://support.microsoft.com/default.aspx?scid=kb;en-
us;892350
What firewall is involved? If you search the help for
Microsoft Antispyware, it has some information about what
needs to be allowed out through a firewall that controls
outbound traffic.
Is your Internet Explorer or Outlook Express set to work
off-line or on-line? Please check in the File menu of
Internet Exporer or Outlook Express - the "Work off-line"
option should nºt be checked.
Do you have a software or hardware firewall that
controls outbound connections?Let us know how it works
out.
Good luck
Engel