Installed Ubuntu via Wubi, only reading 2.9 GiB of Ram

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http://askubuntu.com – So I just installed Ubuntu 10.10 via Wubi over Win xp pro 32bit, my processor is x64, and I have 4GB of RAM installed, the Ubuntu installs as 64bit but it only shows 2.9 GiB of RAM even tho the OS is 64bit, why is this? The whole reason i did this was because with windows xp you cannot use a 32bit license for 64bit version, unlike Vista/7 which works as long as version is same (pro ultim etc) and I need 64bit, but its only reading 2.9 :S? (HowTos)