InfoPath Dev

im having error when click on the hyperlink to sign the infopath form which i open in browser from SharePoint 2007. The error is
"Installation of an add-in component needed for digital signatures failed. You may need to modify your browser security settings."

but i can successfully sign my infopath form if open using InfoPath.

I tried to enble all the options in IE Security tab, but i still have the same problem.

Please let me know if you guys know where i make mistake

Digital Signatures are also supported when filling in forms from the Office Forms Server using a Web browser. This is achieved using an ActiveX control which can be downloaded to the client machine.

When the user initiates signing of a form in Internet Explorer, the browser will download and install an ActiveX control which enables digital signature support in Web-enabled forms. Digital signatures are supported out of the box for Internet Explorer only, but the platform is extensible so that support can be built by partners for other browsers and platforms.

Hope this helps.

Thanks Mahitha for your reply. but i still do not know how to solve my problem. i do not know why it gives me that error message. and what should i do so that i can sign it in browser.