vincentkong.com

1. Backup the current Portable-VirtualBox installation on your USB drive. e.g. G:\PortableApps\Portable-VirtualBox
2. Download the latest version of Portable-VirtualBox and copy it into G:\PortableApps.
3. Executing the downloaded file Portable-VirtualBox_v3.0.8-Starter_v4.0.0-Win_all.exe will bring up the dialog box below.
4. Click on the “Download Installation file of VirtualBox” button to download the VirtualBox installation file.
   
5. When the download has completed the path of the VirtualBox installation should be filled in.  Check the “Extract the files for a 32-Bit/64-Bit system” checkbox based on your system and click on the “OK” button.
   
6. A new directory should be created in G:\PortableApps\Portable-VirtualBox.  Inside the directory execute Portable-VirtualBox.exe and the VirtualBox installation will be extracted in G:\PortableApps\Portable-VirtualBox\app32.
7. From your backup Portable-VirtualBox copy all the files inside \data\.VirtualBox into the new directory G:\PortableApps\Portable-VirtualBox\data\.VirtualBox
8. When the copying has been completed you can run the newly upgraded version G:\PortableApps\Portable-VirtualBox\Portable-VirtualBox.exe

Related posts:

1. Running Windows Within Windows
2. Running Skype on USB Drive
3. Portable Remote Desktop Client for Windows
4. Installing Guest Additions for VirtualBox
5. Running VirtualBox in Ubuntu