I probably should have mentioned yesterday - I am using Windows 7 Professional 64 bit, with Service Pack 1.
I have tried to run through things a bit more logically, here's what I've found so far.
If I open configure vJoy I get the following requester -
If I click Yes, it the configure utility opens, and appears to work. It always opens to its default screen, and doesn't appear to remember any changes I make. However opening vJoy monitor shows the changes have been accepted by vJoy. So, maybe this is normal.
When I open Sx2vJoy, I get a security warning.
Yesterday clicking run gave me this error message -
I put my security settings back to normal today and tried again. This time when the security warning popped up I unticked the 'Always ask before opening this file' box.
After clicking run I received this -
I clicked yes and got the message 'SpacePilot connected to vJoy ID 1' - success!
I don't know if it was running it yesterday with the security setting turned off, or, if it was unticking the notification box that made the difference, but it now appears to be working! Perhaps somebody out there who is savvy with Windows security settings could explain what causes this issue. Since most people don't have a problem it suggests a setting on my PC somewhere.
I haven't configured it fo Elite yet so I may still have other problems to overcome.