I had to give up! I
had been left with a folder in Program Files containing only a cab and msi file. I reinstalled from there and my machine went into constant reboots (having 'seen' the Virtual Network bits). No sign of
VB in 'Add/remove' so sys restore put me back to normal. I now (again) have an Oracle folder with what looks like a 'full set' of files but no exe!
Lots of head scratching.