KB156640 - How to Troubleshoot a STOP 0xC0000218 Error Message (http://support.microsoft.com/?scid=kb;en-us;156640)
KB307545 - How to Recover from a Corrupted Registry that Prevents Windows XP from Starting (http://support.microsoft.com/?scid=kb;en-us;307545)
KB314874 - How to Troubleshoot a Stop 0xC0000218 Error (http://support.microsoft.com/?scid=kb;en-us;314874)
KB815011 - Cannot Disable the Registry Repair and Recovery Feature in Windows XP SP1 (http://support.microsoft.com/?scid=kb;en-us;815011)

Bug Check 0xC0000218: STATUS_CANNOT_LOAD_REGISTRY_FILE (http://www.osr.com/DDK/ddtools/bccodes_0t5z.htm)