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I would reference the number that you gave above:
C51GM03A1-2.0-8EKRS
It appears that you have an Acer motherboard, but I am having a hard time finding any info on it.
At this point I would suggest that you contact Acer Support through email. explain that you need a manual for your motherboard. Here is a link to the page:
http://acer.custhelp.com/
AMD 64 is your processor. We need to know what make and model your computer is and what motherboard you are using.