The KSR10/USB x64 drivers supplied with the USB interface are not digitally signed.
Therefore they can not be used with Vista or Windows 7 x64.
(for drivers used with x64 Windows versions 6 and higher signing is a requirement)
To see if the driver itself is working fine i did use F8 during boottime to disable the driver signing requirement.
The driver works fine then, so the driver is ok, it really is the signing that is the problem.
The F8 workaround is not a permanent resolution because it is a security issue, and it requires me to press F8 and select ‘skip’ every boot.
Is there any signed driver available?