I had already looked at the log before posting my previous message. And, from the previous problem I had I had already worked out that the software was failing to write something somewhere.
I had also checked, double checked and triple checked that the various directories listed in the install requirements were set to read/write. They wera at every check and I've check again and they still are.
These facts are, indeed, a clear indication of a problem - but not where you seem to think. Unless, that is, there is another factor relating to windows servers you haven't told me about.
A solution is required.