Thanks for letting us know. Microsoft released a windows update a while ago that caused the method described in the link above to stop working.
But there are two other methods for disabling the driver signing requirement in Windows Vista 64-bit edition, and I tested both of them a week ago and they both worked.
The simplest method is when you are booting up windows, press F8 to bring up the Advance Boot Options Menu. Select “Disable Driver Signature Enforcement” and press enter. When windows is done booting, you should be able to use our CP2102 drivers. You will still get error messages from windows about the drivers having invalid signatures, but you will be able to use the device. You must remember to do this every time you boot up Windows, or else you will not be able to use the drivers for that session.
Another method is to download a third party utility called the Driver Signature Enforcement Verifier.
- Download the utility from http://www.ngohq.com/home.php?page=dseo.
- Use the utility to Enable Test Mode.
- Reboot your computer. You should now see the words “Test Mode” written in all four corners of your desktop.
- Use the utility to sign the following system files:
- Unplug and replug your device, and it should work.
Please let us know if these methods work for you!