Cannot find which application uses port with netstat

Cannot find which application uses port with netstat gives me a PID of 4 but in my vista task manager I can't see any process with such PID.
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Guest [Entry]

"It's possible the process is running as a different user, click show processes from all users:

You can also use netstat -b which will show you an executable name as well as a PID:

Proto Local Address Foreign Address State PID
TCP john:1038 localhost:1039 ESTABLISHED 1400
[firefox.exe]"