We have our device driver signed digitally through purchasing "CodeSigning For Microsoft Authenticode", on Windows 7 Enterprise 64-bit system, when the driver is being loaded, a "Windows Security" pops up with title "Windows can't verify the publisher of this driver software". "Install this driver software anyway" is clicked and driver is loaded successfully, and the driver works fine, this means that the driver is digitally signed, otherwise Windows doesn't take driver without signature in 64-bit system. Why the "Windows Security" still shows even the driver is signed? how to remove this warning?
It seems that the signing has not been applied correctly. Here is reference to MSDN info on signing:
Also give a try to specific MSDN Forum codesigning