I seem to be getting absolutely nowhere installing drivers for the UNO. I think I have now tried every suggestion on this forum (and other sites) to no avail.The situation is now as follows :
When the UNO is plugged in the windows 7 system fails to detect it. Looking in device manager there is an unknown device. I select this and then "reinstall driver" browsing to the directory where the .inf file resides (I have checked that this file is in fact there. I get the following response:
Windows found driver software for your device but encountered an error while attempting to install it.
Arduino UNO. There is no driver selected for the device information set or element.
I know that the board works OK on two other computers (one of which is running windows 7) But I would have thought that it should also run on this one which has always installed all other programs satisfactorily.