Question: maple 10 changes + and - for C´s and K´s in Word 2007

Hi i´m writing a paper about math and i use maple 10 and M. Word 2007 for it, i started with a Laptop with Windows 7 and when i finished it, i open the archive in a desk computer having the same especifications  i notice that the images of ecuations were altered changing "+" and "-" for "C´s" and "K´s", i tried a lot of computers with others especifications and my problem still the same, i changed the format and other stuff but i can´t send the paper ´cos when i send it to the office of charge in my school they have other computers and before they print it, they should edit it in their computers.
I really need this help so if you can help me i´ll really apreciate it.

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