Follow VirtualBox on Arch Wiki.
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Install VirtualBox:
pacman -S virtualbox virtualbox-host-modules qt4 ...
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Load VirtualBox kernel driver manually:
modprobe vboxdrv
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Download "VirtualBox 4.3.14 Oracle VM VirtualBox Extension Pack" (file name: Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack) from its official website;
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Install it with root:
vboxmanage extpack install Oracle_VM_VirtualBox_Extension_Pack-4.3.14-95030.vbox-extpack
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Start Virtualbox as user chad:
VirtualBox
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Import VM template (Win7Office.ova), modify shared folder, start it.
Ref:
Installing VirtualBox extensions: error getting authority Download VirtualBox