You must be logged on as an administrator to perform these steps.
Certificates are used primarily to verify the identity of a person or device, authenticate a service, or encrypt files. Certificates are usually provided for you automatically. For example, if you purchase something online using a secure website, a certificate might be used to encrypt your credit card information. If you want a certificate for your personal use, such as providing a digital signature in e-mail messages, it might not be provided automatically. In this case, you would contact a certification authority to request a certificate and import it. For more information, see Import or export certificates and private keys. If you work for an enterprise that uses certificates for network access and the certificate is not automatically renewed, you might get a message saying that a certificate has expired. Follow these steps to get a new one or to renew one.
These steps only work to request a certificate from an enterprise certification authority. You must be logged on to a domain that has an enterprise certification authority to request a new certificate. Check with your network administrator if these steps don't work.
Open Certificate Manager by clicking the Start button , typing certmgr.msc into the Search box, and then pressing ENTER.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Click the Personal folder.
Click the Action menu, point to All Tasks, and then click Request New Certificate.
Follow the steps in the wizard.
You cannot request a certificate for a service.
To request a Digital Signature Standard (DSS) certificate from a certification authority, you must select the User Signature Only certificate template in the Certificate Request Wizard.
Click the certificate you want to renew.
Click the Action menu, point to All Tasks, and then do one of the following:
Click Renew Certificate with New Key.
Point to Advanced Operations, and then click Renew this certificate with the same key.
Complete the wizard to renew the certificate.