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I use Windows Vista 32 bit with 2 GB of RAM and now want to increase my RAM of 2 GB up to 4 GB.

Does changing RAM of 2 GB up to 4 GB needs reinstalling windows vista 32 bit? And does 4 GB of RAM needs changing Windows Vista 32 bit to 64 bit?

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No, you do not need to reinstall windows. No, you do not need to change to 64 bit, but Vista will only be able to use 3.2-3.5gb max. For reference:

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