Hi Larry,
Thank you for posting. To get the security certificate, browse to VPN-> VPN Client Accounts. Look for Certificate Management and press Export for Client. Save the file in C:\Program Files\Cisco Small Business\QuickVPN Client (or equivalent) on the client PC.
Note that the certificate is not required to connect. It is simply a warning to the end user that they may not be connecting to the correct router. If the certificate is installed the warning popup will be disabled.
