Can I add an additional 1 GB of ram to upgrade Windows XP 32 bit to Windows 7 Professional 64 bit?

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I have a Gateway Windows XP with 2 RAM slots. Originally, there were two 256 MGs of RAM. To increase my RAM, Gateway sent me Kingston 1 GB DDR2 of additional RAM. In order to upgrade to my XP 32 bit to Windows 7 Professional 64 bit, I need an additional
1 GB of RAM. My questions are as follows:
(1) Can I just install another 1 GB of RAM in the slot currently containing one of the original 256 MGs of RAM? (2) Do I have to get a DDR module of the 1 GB of RAM? The Kingston instructions say that DDR2 and DDR modules are not interchangeable. (3)
What is DDR?

Thanks.

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