Security Issue?

[Jesse]

Due to another problem, I was in the Event Log for my Windows XP machine, 
and noticed several suspicious entries regarding WinVNC4:

All of these entries were received on 9/30/2006 at 2:35:02 AM

* Connections: closed: 71.141.133.10::62311 (Requested security type not 
available)
* Connections: accepted: 71.141.133.10::62311
* Connections: closed: 71.141.133.10::62309 (Clean disconnection)
* SocketManager: unknown listener event: 0
* Connections: accepted: 71.141.133.10::62309

There are many such entries that go back to late August. The IP address 
indicated appears to be out of San Francisco, CA. I have not given anyone 
permission to access my computer from there, so this appears to be someone 
that has found a way into the system, unless I am mistaken about what this 
seems to be saying. Is this another bug like a few months ago that will let 
other people into my system due to some error?

I have closed VNC and will keep it down until I figure this out, bit I hate 
to loose such a great tool! Any ideas?