Ubuntu installation in VirtualBox - not using base memory in RAM

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http://askubuntu.com – I am installing Ubuntu right now under VirtualBox in Windows 7. It is going extremely slow and VirtualBox.exe is only using about 128 mbytes of RAM instead of the 1024 I set Base memory to. Is it supposed to do this? It might be an off topic question but I try asking here. (HowTos)