System Event Log Error 552

I found this error in the System Event Log of my Windows XP. This error started after upgrading domain into Windows 2008 R2. I have to open the LDAP in SSL.
I submitted a request to a third-party CA as per the instructions in Microsoft website. What should I do next? Please help me.

Event Properties – Event 36888. Schannel
General Details
The following fatal aIert was generated 48. The internal error state is 552,
Log Name: System
Source: Schonnel Logged: 11/29/2010 2:21:30 PM
Event ID: 36888 Task Category: None
Level: Error Keywords:
User: SYSTEM Computer: saravana-PC
OpCode: Info
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