I recently was able to build a computer from spare parts.
I need an operating system for it though.
I have a chance to get a windows coa number OEM without the windows xp cd.
I have seen the package and everything looks ok. It has a sticker with the coa number to put on the back of the pc.

My question is, can I buy the coa and install windows xp with a retail upgrade cd and just put in the coa numbers. Or does this have to be a brand new computer never been regestered with a special cd.

The system I'm thinking about installing the operating system in has been registered before and its windows XP operating system is in another computer and has been activated by Microsoft. I just want to know if I have to buy a retail version or I can just get a coa number and put it in.

thanks