Knoppix 7.6 and Oracle VirtualBox

I have been a long term user of Knoppix and generally been happy with it 'out the box'

But I am at a loss on how to get Virtualbox working on Knoppix 7.6 so have been stuck using 7.0 which seems to be the last release with a working version of VirtualBox.

I have spend hours googling the problem and think that I am now pretty close - but no cigar.

After a reboot I get the familiar driver missmatch messages- but this is wha I have done on a clean install of KNoppix 7.6 32 bit.

Add the following line to /etc/apt/sources.list:
deb http://download.virtualbox.org/virtualbox/debian wheezy contrib (stretch did not seem to work)
sudo apt-get remove virtualbox*
wget -q https://www.virtualbox.org/download/..._vbox_2016.asc -O- | sudo apt-key add -
wget -q https://www.virtualbox.org/download/oracle_vbox.asc -O- | sudo apt-key add -
sudo apt-get update
sudo apt-get install virtualbox-5.1
sudo apt-get install dkms

And I get this error message when I try and run an environment:
RTR3InitEx failed with rc=-1912 (rc=-1912)

The VirtualBox kernel modules do not match this version of VirtualBox. The installation of VirtualBox was apparently not successful. Executing

'/sbin/vboxconfig'

may correct this. Make sure that you do not mix the OSE version and the PUEL version of VirtualBox.

where: supR3HardenedMainInitRuntime what: 4 VERR_VM_DRIVER_VERSION_MISMATCH (-1912) - The installed support driver doesn't match the version of the user.

If I run this command its a little hit or miss if it works - but I end up back in the same state following a reboot.

Does anyone have a working set of installation instructions?

Regards
John