ActiveX in Outlook 2003

I’m unable to insert my signature into Outlook 2003 documents without receiving the following message:
Error: Your current security settings prohibit running activex controls on this page

All security settings in IE are on low for the Intranet and the MSOffice security has all ActiveX components Enabled. The security/macros settings within Outllok itself are low.

This message does not come up when I use MSWord as my e-mail editor; however, when I use Outlook 2003 on its own, I get this message every time I attach a signature, even though the signature contains only text.

Any help would be appreciated