Running VirtualBox in Ubuntu with Windows 7 as Guest OS

Steps:

1. Install VirtualBox with the Synaptic Package Manager (pick package "virtualbox-ose").
2. After that is done, you can run the VirtualBox UI via the launcher in the "Applications" menu.
3. Create a new Machine, give it like 1GB of memory and enough HDD space (e.g. 20GB).
4. Enable "IO APIC" in Settings --> System. This will help prevent a "0xC0000225" error.
5. Insert Windows CD and boot up the VM.
6. Install the OS

Systems:

1. Ubuntu 10.10 x64
2. Windows 7 x64

References:

1. www.xqwzid.com/servers/error-0xc0000225-server-2008-r2-and-virtualbox/
2. www.linuxquestions.org/questions/linux-software-2/virtualbox-2-1-on-fedora-64-bit-wont-install-windows-7-beta-64-bit-696358/
3. www.raymond.cc/blog/archives/2009/01/14/step-by-step-on-how-to-download-install-and-activate-windows-7-beta-without-messing-currently-installed-os-and-dual-boot/
4. help.ubuntu.com/community/VirtualBox/Installation
5. help.ubuntu.com/community/VirtualBox/FirstVM