If VirtualBox is not starting the guest OS and it displays Failed to open session for the virtual machine, E_FAIL (0x80004005), follow this article to find the solution.

Oracle's VM VirtualBox is a powerful, free, and open-source virtualization tool—but you'll have to do some tinkering to make it work for you.

Oracle's VM VirtualBox is a powerful, free, and open-source virtualization tool—but you'll have to do some tinkering to make it work for you.

While perhaps not as polished or as easy to use and configure as competitive desktop virtualization products from Parallels and VMware, the latest release of Oracle VM VirtualBox 4.2 is getting ...

VMware Workstation 11 has the edge in performance and polish, while VirtualBox 2.3.20 leads in platform support and price.