If you have the need to log Com calls… in XP SP2 and Windows Server 2003 SP1 there is a new feature….
Set the HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\CallFailureLoggingLevel
Registry named valued to 1
This is a named-value that is set to a REG_DWORD that sets the logging of COM call failures via eventlogs.
After setting this key check eventlog Application log.