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Hi Chris,
As Andrew has mentioned, try using an older driver. I have had to do this exact thing as I had one of those counterfeit chips, (or so I assumed), and the new drivers did not work but I eventually found some older ones that did work.
I have found the Jaycar USB to RS232 cables always seem to work and if they don't, Jaycar will always accept returns. Bit more pricey though.
If using an Arduino to connect to non TTL devices, you could use a MAX232 chip or equivalent to get the correct voltage levels.
Oh and also, after you have uninstalled the old driver, unplug the cable from the USB port and install the next driver with the cable unplugged. Then when you plug in the cable, hopefully the driver will see the hardware and all OK, hopefully!
Cheers,
Damien.
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