Fail to create a certificate : OID allready exist

Hi all,

I use a Windows 2008 R2 PKI, the PKI is integrated in AD.

1. I've created a new template with a specific OID.
2. The new template has been deleted
3. When I start to create a new template with the same OID, the message is that the OID already exists.

How can I delete this information to be able to create a template the my specific OID?

(I've the full access on all templates)

Thanks in advance