Windows 7 - Prolific USB-To-Serial Driver

Hardware ID = USB\VID_067B&PID_2303


I have been all over the internet looking for a driver that works with this device. I am running Windows 7 Ultimate RTM 64-Bit. Every driver that I have found that will "work" absolutely does not work. Any ideas on a working driver?

Maybe you shouldn't have looked all over the internet, but just on prolific website:

Welcome to Prolific

Do you happen to have the original disc that came with the adapter? If you do, use the supplied Vista driver and it will work perfectly. I had a devil of a time getting any driver to install from the Prolific website, and was pleasantly surprised when the supplied drivers worked. However, I've found at least one application that uses the serial adapter (ie: ProntoEdit 4) but doesn't work like it should under x64, so I've had to work from inside an XP virtual machine instead.

If you don't have it, send me a PM and I'll see if I can upload the file somewhere for you.

Maybe before posting a comment like that SillyMan you would assume that I would have tried that. The site says that it supports Windows 7 64-Bit, but I can assure you that it doesn't. I wouldn't have posted here, had the OEM driver worked.

As for the supplied CD. I have tried to install and force install the driver from the cd. I have even tried universal extracting the .exe to get the .inf out of .exe and try that, but it doesn't work. All of the drivers I have found either say invalid driver, or they say they aren't signed. Now on that note I have even tried a program that supposedly enters Windows 7 into "Test Mode" and sign the drivers, but that doesn't work either.

Any suggestions?

I didn't have any problems installing the PL-2303 drivers from the disc supplied with my USB-DB9 adapter. The version I have has a modified date of 12/24/2007, and is called the PL-2303 Vista Driver Installer. Is this the same one you have?

No, this isn't the same one that I have. I have tried the one from 2009 as well as the one from July 2007.

Here is the message I am getting in Device Manager:



Here is the driver that came with my device:



If your driver is working keg, could you post it to rapidshare or megaupload? It would be worth a shot to me if you have the time. I would greatly appreciate it.

PM sent.

Well, I tried both.. Here is what I got...






Still not working. Any ideas?

Uninstall everything. Reboot. Right click on the Vista driver and run in Vista compatibility mode.

Alright, I did that.. I uninstalled all drivers I had installed then rebooted. I then installed the driver in vista compatibility mode and rebooted.

I plugged in the device and got this:



ughhh!! Any ideas?