Increase usable RAM and changing OS

Please guys, I am using a hp pavilion dv6 core i3 with 2.4GHz and 4GB RAM but usable is 2.48GB and I am on windows 7 ultimate with 32 Bits. Is there anyway I can increase the usable RAM or if possible can someone help me with how I can change from 32 bits to 64 bits OS. Thanks and GOD bless.
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