I don't know if it is a mistake from VirtualBox developpers or if it is by design but something changed in the registry.
VirtualBox version is now in HKEY_LOCAL_MACHINE\Software\Oracle\VersionExt instead of "Version".
"Version" has %VER% as value.
This is messing with Portable-VirtualBox. I will fix that in my next Portable VirtualBox pack.
Here is a quick workaround :
- Open regedit.exe as Admin
- Go in HKEY_LOCAL_MACHINE\Software\Oracle
- Change "Version" value from %VER% to 4.0.8
Your portable version should now be able to run your LinuxLive USB !