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How to change widows 7 from 32 bit to 64 bit

Last response: in Windows 7
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hi there

i recently sent my pc in for repairs how ever they didn't install the 64bit widows 7 and now my PC is only using the 3 out of 6 gigs of ram i want to change to 64bit but im worried about my drivers on my PC cause the grafics card driver is allocated to 32 bit and when i go on the net i cannot find a 64bit driver and not really sure how to do it?

any ideas?

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