Папку нашел, открыл, а дальше не знаю.куда поставить, то что вы написали.
<?xml version="1.0"?>
<!--
** DO NOT EDIT THIS FILE.
** If you make changes to this file while any VirtualBox related application
** is running, your changes will be overwritten later, without taking effect.
** Use VBoxManage or the VirtualBox Manager GUI to make changes.
-->
<VirtualBox xmlns="
www.innotek.de/VirtualBox-settings" version="1.7-windows">
<Global>
<ExtraData>
<ExtraDataItem name="GUI/DetailsPageBoxes" value="general,system,preview,display,storage,audio,network,usb,sharedFolders,description"/>
<ExtraDataItem name="GUI/LastWindowPosition" value="255,220,770,550"/>
<ExtraDataItem name="GUI/LastWindowPostion" value="255,220,770,550"/>
<ExtraDataItem name="GUI/RegistrationData" value="triesLeft=2"/>
<ExtraDataItem name="GUI/SplitterSizes" value="302,463"/>
<ExtraDataItem name="GUI/UpdateCheckCount" value="3"/>
<ExtraDataItem name="GUI/UpdateDate" value="1 d, 2011-07-01, stable"/>
</ExtraData>
<MachineRegistry/>
<MediaRegistry>
<HardDisks/>
<DVDImages/>
<FloppyImages/>
</MediaRegistry>
<NetserviceRegistry>
<DHCPServers>
<DHCPServer networkName="HostInterfaceNetworking-VirtualBox Host-Only Ethernet Adapter" IPAddress="192.168.56.100" networkMask="255.255.255.0" lowerIP="192.168.56.101" upperIP="192.168.56.254" enabled="1"/>
</DHCPServers>
</NetserviceRegistry>
<SystemProperties defaultMachineFolder="D:\Виртуальная машина\Сама машина" defaultHardDiskFormat="VDI" VRDEAuthLibrary="VBoxAuth" webServiceAuthLibrary="VBoxAuth" LogHistoryCount="3"/>
<USBDeviceFilters/>
</Global>
</VirtualBox>