Strange message showed up in a dialog box. should i be worried?

hi. i stepped away from my mac pro (OSX 10.5.8) and when i came back about 20 minutes later saw this message in a dialog box:
This computer's local hostname "mynames'mac-pro.local" is already in use on this network. The name has been changed to "mynames-mac-pro-2.local". (my real name was where i have typed 'my name')
To change the local hostname, open System Preferences and click Sharing, then click Edit and type the name in the Local Hostname field.
i am the only user of my computer so i am wondering if some virus/malware has tried to install something on my computer possibly. Does anyone know why this would show up or what it is about? i don't share files and am the only user of my computer. should i need to change the hostname back to what it was originally?
thanks in advance for your help!

oops. after i posted the 'more like this' sidebar showed the answer to this so i'll try to fix this now. thanks.

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Strange message showed up in a dialog box. should i be worried?

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