4G ram but only 2G usable

Hello,
I changed my OS from WIn8 to WIn7 Pro 32Bit. I notice today that under system it says that I have 4G of Ram but only 2G is usable!!
Is this due to my change of OS?
How do I get all of ram to work.
THanks 

Winnipeg1 wrote:
Hello,
I changed my OS from WIn8 to WIn7 Pro 32Bit. I notice today that under system it says that I have 4G of Ram but only 2G is usable!!
Is this due to my change of OS?
How do I get all of ram to work.
THanks 
Operating System: Microsoft Windows 7 (32-bit)
That isn't due to change in O/S it is the version of O/S your using that determine your RAM usage. 64bit Windows will access more then 2gigs of RAM but 32bit Windows will only go far as 2 to 2.5gigs of RAM usage. If you want full 4gigs or more you will need to have Windows 7x64 to use the full 4gigs of Ram. Also your O/S listing alreadys tells that your 32bit will not use RAM above 2.5gigs.
I am a Volunteer to help others on here-not a HP employee.
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