We tried the administer role but to no avail.
OK. I'm sorry I didn't make it clear that "as Administrator" should be OFF for all software relating to ACP and drivers.

I will contact Mathew Player software developer for Pulsar Observatories Matthew Player <matthew@elecsoft.co.uk> and explain the problem we have withy their ASCOM driver connecting to ACP and tell him of your offer of help is vital in solving this issue.
Excellent. I'm going to bet that he will be able to point you in the right direction without my help. But if he needs to contact me it's rdenny@dc3.com or +1 480 396 9700.