I just received my proMicro 3.3V in the mail the other day and I have been trying to get it to install on Win7 x64. I had issues with windows saying that a driver did not exist for the device (I was choosing the supplied INF file), so I did some investigation.
Turns out that the VID/PID that the board enumerated with was different than the ones specified in the INF file. This was causing windows to think that the INF file did not provide a driver for the proMicro. I was able to get the driver to install (and work) by adding the VID/PID the proMicro actually has into the INF and reinstalling the driver.
The line I added was this: %DESCRIPTION%=DriverInstall, USB\VID_1B4F&PID_0003&MI_00
The difference is the ‘&MI_00’ at the end. There is a line in the file already that is just missing that part.
I added this line to the ‘Device List’ section in the INF (line 88). It was added to both the normal and x64 lists.
After doing that, just go through the device install process again (after first uninstalling the devices), choose the modified INF as the driver for the two devices that get enumerated, and everything should go smoothly.
Hope that helps someone out there!
-Dan