First and foremost, to install Arch in VirtualBox, users must have a computer that supports the x86-64 architecture (64-bit). Also, make sure to download the latest version of VirtualBox.

If VirtualBox is not showing 64-bit Operating System, Enable Hardware Virtualization or Disable Hyper-V. More suggestions are here in this post.

VirtualBox is flexible enough to handle many types of 32-bit and 64-bit configurations. If you need to run a 32-bit version of XP in a 64-bit host, you can do that without any problems.

Sun xVM VirtualBox 2.0 is available now for Mac OS X (all versions, Intel hardware only), Windows (32- and 64-bit XP, Vista, and Server 2003 and 2008), Linux (several flavors), and Solaris (32- and 64 ...

The host system is an AMD 64-bit machine that is also running Ubuntu 10.10 desktop. Here’s the kernel version of the host at the time of this writing: 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 ...