Deleted user Certificate enrollment requests

Question

   We have a user account, "Temp_admin " which was set up as a temporary domain admin, which was deleted  a few months ago. For some reason this account is still triggering and Successfully being authenticated for certificate enrollment
on our internal certificate server. At least according to the application log on Dc#4. Looking at the logs on our certificate server this user does not even exist. event ID's 64 and 65 every 3-4 minutes with this. Any idea how to stop this or atleast keep
it from authenticating?
Server 2008r2 domain.
Certificate enrollment for *******\Temp_admin successfully load policy from policy server 
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
  <Provider Name="Microsoft-Windows-CertificateServicesClient-CertEnroll" Guid="{54164045-7C50-4905-963F-E5BC1EEF0CCA}"
EventSourceName="CertEnroll" />
  <EventID Qualifiers="33370">64</EventID>
  <Version>0</Version>
  <Level>0</Level>
  <Task>0</Task>
  <Opcode>0</Opcode>
  <Keywords>0x80000000000000</Keywords>
  <TimeCreated
SystemTime="2014-09-02T19:56:04.000000000Z" />
  <EventRecordID>99069</EventRecordID>
  <Correlation
/>
  <Execution ProcessID="0" ThreadID="0" />
  <Channel>Application</Channel>
  <Computer>MDSTVDC04.*******.local</Computer>
  <Security UserID="S-1-5-21-420886195-1495481658-928725530-6981" />
  </System>
<EventData>
  <Data Name="Context">*******\Temp_admin</Data>
  <Data Name="ServerID" />
  </EventData>
 </Event>
Certificate enrollment for *******\Temp_admin is successfully authenticated by policy server {0E730552-3DDB-465A-83AD-CFAF040B236B}
<Event xmlns="http://schemas.microsoft.com/win/2004/08/events/event">
<System>
  <Provider Name="Microsoft-Windows-CertificateServicesClient-CertEnroll" Guid="{54164045-7C50-4905-963F-E5BC1EEF0CCA}"
EventSourceName="CertEnroll" />
  <EventID Qualifiers="33370">65</EventID>
  <Version>0</Version>
  <Level>0</Level>
  <Task>0</Task>
  <Opcode>0</Opcode>
  <Keywords>0x80000000000000</Keywords>
  <TimeCreated
SystemTime="2014-09-02T19:56:04.000000000Z" />
  <EventRecordID>99068</EventRecordID>
  <Correlation
/>
  <Execution ProcessID="0" ThreadID="0" />
  <Channel>Application</Channel>
  <Computer>MDSTVDC04.*******.local</Computer>
  <Security UserID="S-1-5-21-420886195-1495481658-928725530-6981" />
  </System>
<EventData>
  <Data Name="Context">*******\Temp_admin</Data>
  <Data Name="ServerURL">{0E730552-3DDB-465A-83AD-CFAF040B236B}</Data>
  </EventData>
  </Event>

Answer 1

Temp_admin is deleted from the domain
sid2username output: Error evaluating user name. Some or all identity references could not be translated. 
Tested with Known accounts and they work so Temp account can not be found.
First thing I tried to do was search the AD Domain by both the sid and username and they could not be found. I was involved in a motorcycle accident and a temp was hired for the 3 months I was away. The temp did not leave on good terms and the account was
deleted as soon as she left the building. 
This user was still listed under user profiles in the registry with that sid. 
I deleted all references to the sid from the registry on that DC and restarted the server and the issue has disappeared. Really don't think I should have had to go this route though.