renewing certificate on windows 2003 - need new certificate with key size of 2048 bits

I have a Windows 2003 server running Exchange 2003 and I am trying to renew the current certificate but when I try to renew it through RapidSSL, I get the following error;

Your CSR contains a key size that is no longer considered secure. Security best practices require a minimum key size of 2048 bits. Please submit a new CSR with a minimum 2048 bit key size.

How do I fix this?
johnbowdenAsked:
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Alan HardistyCo-OwnerCommented:
You can't pick the key size when renewing, so you will have to remove the current cert from IIS Manager and then request a new certificate, selecting the new Key Size when you run the wizard.
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Windows Server 2003

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