I got many event ID 19 on W2k pro machine.
Source:Windows Update Agent
Description: Installation Successful: Windows successfully installed the following update: Update for Windows 2000 (KB922582)
in the computer field I can se the name of my computer and for the same event ID I can see a different computer name in the next line.
I don't know where it got the computer name from. I tried to ping the name but it says uknow host.