Problem with FTDI driver

Forum 2005-2010 (read only) Hardware Troubleshooting
1

Hi

I have a computer running Windows XP version 5.1 service pack 3.
A few days ago I installed the software to run a Arduino Duemilanovemicroprocessor board and with that install I loaded the FTDI USB drivers that came with the Arduino software download. The FTDI USB driver (FT232R USB UART) installed just fine and I was able to COM8 was recognized as attached to the board.

Now today the board (or computer??) doesn't' find the COM port. With the board plugged in, when I look in the Device Manager I see that the FT232R USB UART driver in the Universal Serial Bus Controllers section has yellow circle with a ! in it. I think meaning that the driver has a problem. When I try to reload the driver using Windows "New Hardware Found" process the process finds the driver in the folder I have it in and try's to load it. But the load fails and I get the error screen saying "Cannot Install this hardware, an error occurred during install of the device, Access is denied.

I reloaded the Arduino software and still have the same problem.

As I mentioned above, I was originally able to load the drivers and was able to connect to the board, but now I can't

Can anyone help?

Thanks

Steve

** Additional info -- I was able to load everthing and get it working on another XP computer, so the board is okay.

2

Have you tried depriving the computer of power ? Not just restarting it - shutting it down, turning off its power at the wall, and if its a laptop removing its battery as well. The chipset which sometimes can get its knickers in a twist often remains in a crashed state when the computer is restarted. When this happens stuff like USB and serial ports often don't work as expected and needs a cold reset to get it going again.

3

Sounds like a permissions problem. This page has some steps that might provide more detail about the problem.