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Ummm just were abouts are you getting this message... is it possible to screen shot and upload the pic to tinypic.com so we can see?

I did a full system scan, And can't find any file which is...

But, his message which he revieced isn't a type of message you get if its blocked. It would say "this command has been blocked by your administrator". But, we don't know yet. As it doesn't even...

Try Msg command, I do it at my college for a laugh to the whole network.

Ill shall explain.
Open Command Prompt. (RUN > cmd)

Then type

msg * hello

That will send a message to every...