Retail 'Key' problem

M

MC

I bought "Office Home & Student" retail. On the back of the box it says
"licensed for 3 PC's". I have 2 computers. I successfully installed this on
my first computer
and the product key was accepted. On the 2nd computer installation it
keeps refusing the same product key so I cancelled the installation. Why
doesn't it accept the key for the 2nd computer? What do I do?
 
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