Certificate Authority, downloading Active X control

Hello,

My CA is in Windows Server 2003 R2 Enterprise Edition SP2. The versión of CA is 5.2.

I have the Windows Certificate server configurated in that server with a MMC 3.0, and also vía http://domainserver/certsrv.

With MMC I don't have any problem, but with http://domainserver/certsrv I have the following problem:

• When I select "request a certificate", "advanced certificate request", "create and submit a request to this CA" the following message appears: "downloading Active X control". Despite this message I can work with the page, and when I select "web server" as a certificate template, the following message appears: "you need to install the following CSPs before the enrollment, Microsoft RSA SChannel Cryptographic Provider, and Microsoft DH SChannel Cryptographic Provider".
• When I select "request a certificate", "user certificate", the same message appears "downloading Active X control".

Someone knows how I can fix this problem¿?

Thanks.