Thankyou for the copy of the usbadc11.xls file. I extracted it and used it on the PC running Office 2003 and it worked correctly as many times as I cared to! The macro GetAdc11 is Identical in the copy that you provided and works and the One I was using and does'nt!!
The Copy of usbadc11.xls however still does not work and acts as described above on the machine with Office 2007 on it?
Anyway I am happy now and will persevere on the PC with Office 2003 on it, maybe the problem is Office 2007 running in compatability mode for usbadc11.xls, or something but I shall not br exploring it any further.
Is there any descriptions of the USBADC11 Driver Routines available?
Thankyou very much for all your good work and help, Robin and Ziko.
and a Merry Xmas to you and all at Pico.