Can't upload to COM7 because it is already in use

Development Tools IDE 1.x
1

For some reason, I can't upload to my Arduino Board
I've already tried changing the port and restarting my laptop.

It was COM5, but I changed the name to COM7
I tried killing processes in Task Manager, but to no avail.

Could I be helped?

This is my error code:

processing.app.SerialException: Serial port 'COM7' already in use. Try quiting any programs that may be using it.
at processing.app.Serial.(Serial.java:144)
at processing.app.Serial.(Serial.java:76)
at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:75)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:93)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:56)
at processing.app.Sketch.upload(Sketch.java:1603)
at processing.app.Sketch.exportApplet(Sketch.java:1568)
at processing.app.Sketch.exportApplet(Sketch.java:1524)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2293)
at java.lang.Thread.run(Thread.java:619)
processing.app.debug.RunnerException: Serial port 'COM7' already in use. Try quiting any programs that may be using it.
at processing.app.debug.Uploader.flushSerialBuffer(Uploader.java:99)
at processing.app.debug.AvrdudeUploader.uploadViaBootloader(AvrdudeUploader.java:93)
at processing.app.debug.AvrdudeUploader.uploadUsingPreferences(AvrdudeUploader.java:56)
at processing.app.Sketch.upload(Sketch.java:1603)
at processing.app.Sketch.exportApplet(Sketch.java:1568)
at processing.app.Sketch.exportApplet(Sketch.java:1524)
at processing.app.Editor$DefaultExportHandler.run(Editor.java:2293)
at java.lang.Thread.run(Thread.java:619)

2

Sounds lik a Windows issue. I get this all the time and the workaround is to goto Device Manager, right click on COM7 and select disable and then Enable. Saves having to reboot the PC.

I really wish Microsoft could sort out this Com port issue - I remember it used to work fine a few years ago.

3

Try this: http://arduino.cc/forum/index.php/topic,118440.0.html

I added a wrapper that will try to unlink the used comport (disabling and reenabling the arduinos via software). If problem is fixable a window will pop with a "fix" button.

Tell me if solves your problem. If you can't use the arduino in another machine, the problem is probably in the board (8u2 chip)