Digitally Signed Driver USB to Serial Cable

I've got a usb to serial adapter but can not find a working driver for it.

When trying to install the supplied drivers it says they are not digitally signed. I asked the manufacturer and they linked me to the drivers I already had claiming they were digitally signed. Also installation states could not find INF file.

Does anyone have windows 7 64 compatible drivers for USB to serial.

On a side note,
I've had luck with Vista 64 bit drivers for other things with Windows 7 64. Does Windows 7 need separate digital signatures than Windows Vista?

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