The Serial Ports setting is blank although the drop-down list correctly shows (only) COM3, the port for my board. Sketches compile correctly but the upload fails with the message:

[font=Courier]Compiling 'Fade' for 'Arduino Diecimila or Duemilanove w/ ATmega168'
Binary sketch size: 1260 bytes (of a 14336 byte maximum) (0.2390137 secs)
Upload requires a serial port or programmer. Upload cancelled[/font]

This is a new installation of Visual Micro:

    Visual Micro Version 27
    Upload using Programmers : [i]False[/i]

    Windows 7 Ultimate 64 bit
    Visual Studio 2010 Professional

    Arduino 1.0 : "C:\arduino-1.0"
    Sketchbook: "C:\arduino-1.0\SLK"
    Duemilanove w/ATmega168
 
[i]The Arduino IDE works fine. I am able to compile and upload successfully. The Arduino IDE uses COM3.[/i]

I have tried cycling the selected board in the Arduino Boards drop-down but the Serial Ports setting remains blank. Clicking on the setting shows the list with "COM3" but selecting it does not set the field.

I tried resetting the addin using the command line below but it did not seem to have any effect:

[font=Courier]    devenv.exe /resetaddin Visual.Micro.Visual.Studio.Arduino.Helper[/font]

The "Arduino" entry does not appear in my Tools menu, perhaps because the board is not recognized.

I had an earlier version of Visual Micro installed and I was able to upload successfully to the same Arduino board. I uninstalled that version several months ago.

In the meantime, I took a side trip to explore Netduino but I'm back now because of the great Arduino community and the promising directions for Visual Micro.

Thanks in advance.

All is well; after a reinstallation, VM is working well.

Yes, there was 1 entry for Visual Micro in Tools->Options. The version number was 27. There were no Project->Add Arduino Library or Add New Arduino Item menu items.

Next, I followed the instructions here http://www.visualmicro.com/page/How-to-uninstall-the-arduino-addin-for-visual-st... to uninstall including removing the Registry entries.

After uninstalling, the Arduino Boards and Arduino Serial Ports toolbars were still listed in the right-click context menu. They also still appeared in the Customize dialog box  where I deleted them.

FWIW, this file (5/29/2011 timestamp) was present in my Visual Studio 2010 Addins folder:

     Visual.Micro.Visual.Studio.Arduino.2010.AddIn_

I removed the file and re-installed at which point everything works great. Onward!