WinXP Host w/Xubuntu 12.04 Guest & Virtualbox Runs Extremely Slow on Acer Netbook

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http://askubuntu.com – As a newbie I am experiencing great pain with Xubuntu 12.04 (Guest) running on WinXP Service Pk3 (Host) Acer Aspire One(Netbook: 1.6 Ghz CPU/1.5 Gig Ram) w/VirtualBox. Started three weeks ago trying to download/install and tweak the following: VirtualBox 4.1.18...win.exe (live desktop version & downloaded as .torrent--3 day process) Xubuntu 12.04 --used .torrent download using Vuze...another 3 day process (Note: Have extremely slow Internet: Using Cricket Broadband) Installed Virtual Machine using 512MB Ram; 10gig hard drive with Video 12MB. Didn't discover Software Center & Synapti (HowTos)