Message at boot up

I wonder if anybody knows the answer to this .
A computer I have comes up with a message early in the booting up process.
It says "this computer is the property of a well know company ",after this it works OK.
I bought this PC seconhand most of the files were removed.
I reloaded windows ,but it has not removed this message ,I think the program that is doing this is on the hard drive .
How can I remove this message ?

Thanks

Barry Wilkins
 
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