Your network contains a Network Policy and Access Services server named Server1. All certificates in the organization are issued by an enterprise certification authority (CA) named Server2. You have a standalone computer named Computer1 that runs Windows 7. Computer1 has a VPN connection that connects to Server1 by using SSTP. You attempt to establish the VPN connection to Server1 and receive the following error message: A certificate chain processed, but terminated in a root certificate which is not trusted by the trust provider. You need to ensure that you can successfully establish the VPN connection to Server1. What should you do on Computer1?