Cert issues with SBS

Hi All,

I have got three expired certs on my server which i need to renew but having done much googleing I cant get it to work.

Cert 1
Issued by - domainname-servername-CA
template - Domain Controller
requester name - domain/servername$

Cert 2
Same as above but using Web Server template and requester name - domain/administrator

Cert 3
Same as Cert 2 but requested by different user.

Please help, how do I renew these?

Thank you.