You can use any disk that the COA sticker is for. So if its windows xp pro, you have to use a windows xp pro disk then use the COA sticker thats on the side of the computer. It should update just fine and that is legal, you just need to have a copy of that program.
How do you think all the people on CL can offer to re-install a OS on your computer for 30 or 40bucks...they are using your coa and there cd.
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