Can I upgrade from Vista 32 bit to Win 7 64 bit on hp pavillion d4790y?

I have 2 gig ram, but really need to speed it up to 8 gig. I'd like to also get win 7 for the desktop. Before I get any of this, I need to know since my current OS is 32 bit but 64 bit capable, if I install windows 7 64 bit will it upgrade from 32 to 64? And then will the 8 gb RAM actually work if I purchase that as well? Will I run into any problems the hardware inside (processors or motherboard (intel core 2 cpu [email protected] ghz))? I don't understand 32 bit to 64 bit conversions... Thanks
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Hi:
Yes, your hardware is 64 bit capable.
You can install 4 x 2GB of PC2-6400 memory for best memory performance and capacity (8 GB).
You cannot do an in-place upgrade of any 32 bit OS to a 64 bit OS.
You will need to back up all your files, gather any program installation disks/files you want to reinstall on the 64 bit OS, and do what is known as a custom or clean install of Windows 7.
If you live in the USA or Canada, this is the memory I recommend for your PC once you bring it to a 64 bit OS:
4 of these: (the CAS latency is faster than the second link below)
http://www.newegg.com/Product/Product.aspx?Item=N82E16820220279
or
2 of these kits:
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148160
Paul

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