Error in Outlook

[Darcam]

when sending a message I get the following screen "invalid certificate, Microsoft outlook cannot sign or encript this message because your certificate is not valid" then takes me to a different screen to change security settings, have to uncheck 2 boxes

[msperry]

Hi,

In Outlook 2007, go to Tools...Trust Center...E-mail Security. Try unchecking one (or both) of the top two options.