My SSL Cert has expired and I am getting "this certificate has expired or is
not yet valid" when I try to access NRM.

I tried using PKIDIAG to fix the problems, and it said if found 3 problems,
fixed two, and said 0 unfixable problems. If I run it again it says no
problems exist, however the exp date on the cert is still 6/15/08

Can I change this, or do I need to create a new one?