Hi Rob,
thanks for the fast answer. I think I did everything well.
To double check this, uninstalled the driver and started again. I now installed the driver direct under “..\arduino-0021\drivers” (you mentioned, that the UNO need a different driver than the 328). After doing this, the driver is installed – but the driver can't be started (error code 10). So the diver has still a alert sign in the device manager.
What is the right software for W7 64Bit??? In the download I found the windows software, and below a link to 64Bit, but I don't know, if this means W7 64 Bit or Linux 54 Bit.
Regards
Hans