VirtualBox 4.0.0 Problems with XP and Application

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http://www.linuxquestions.org – I installed VirtualBox-4.0.0-69151-Linux_amd64.run and had some problems (I have removed it and gone back to 3.2.12). My "main" virtual machine is Windows XP which I use for only two applications, Stamps.com and TurboTax 2010. Been working just fine through multiple versions of VirtualBox. My 64-bit server is a Dell Inspiron 1750 with 4G RAM. VirtualBox started and when I started XP, it reported that there wasn't enough host system RAM available (!) and some nonsense about freeing memory on the host. Hmm. OK, cut XP down from 1G to 800K and XP started. I did install the guest addit (HowTos)