Confused with network message

Every morning my mom wakes up and find this message:

The name of your computer "******'s iMac" is already in use on this network. The name has been changed to "******'s iMac (1)".

To change the name of your computer, open System Preferences and click Sharing, then type the name in the Computer Name field.


She has a timecapsule and only have one computer on the wireless network. I have a printer connected to it directly. So I don't know why it is saying this. Any ideas on how to stop it from coming up.

I had the "Remote Management" turned on her computer because I was trying to get my ARD3 to work (never did). I discovered the "share screen" mode in ichat. That works beautifully. I turned the remote management off this morning (don't know if that'll help).

Any ideas on why this is giving that message?

open terminal and enter the command

dscacheutil -flushcache

then reboot

then rename computer to what ever you want in the sharing section of system preferences

I tried this and it said that it didn't recognize the command.
Any more suggestions?

I called apple today and got a second level support expert.
I had 2 networks turned on in the Network setting under the System Prefs.
I turned off one of them, they were fighting with each other. Now, they're playing nice.