This indicates a possible attempt to exploit a denial of service vulnerability in Microsoft Windows.
This vulnerability is due to a memory allocation error that occurs when processing specially crafted UPnP (Universal Plug and Play) "NetrDfsCreateExitPoint" requests via RPC (Remote Procedure Call). It can be exploited by attackers to crash a vulnerable system or cause the "services.exe" process to consume a large amount of system resources.
Microsoft Windows 2000 Service Pack 4
Microsoft Windows XP Service Pack 1
Denial of Service.
Apply security patch as given in the Microsoft advisory 911052.