what is Microsoft Certificate Enrollment Control and how do I do it

Learn about Computer Security Digital Certificates and Digital Signing
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Hi eveyone

I’ve had comodo email Certificate before on my xp sp2 pc but not had one for a while

I tried to get my email Certificate using IE 7 my os is Vista home premium

You need to authorize the “Microsoft Certificate Enrollment Control” to install your new Certificate:
Click here to reload this webpage, then…
When you see a Security Warning popup, click Yes to install the “Microsoft Certificate Enrollment Control”.so I tried foxfox got the email Certificate the messege kepps stopimg me

what is Microsoft Certificate Enrollment Control and how do I do it

thanks