Problem uploading code on Arduino Leonardo

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hello. need guidance on arduino leonardo, because whenever try upload code, have errors, or board isn't installing properly. found post yesterday: https://code.google.com/p/arduino/issues/detail?id=1033, similar problems.

ide version used: 1.0.5. os: windows 7, 64 bit.

1. uploading code failed first time. led l (load) off, power led on. ide not see com port ("serial port" option grayed , inactive). error:

code: [select]
processing.app.debug.runnerexception: couldn't find leonardo on selected port. check have correct port selected.  if correct, try pressing board's reset button after initiating upload.
at processing.app.debug.avrdudeuploader.uploadviabootloader(avrdudeuploader.java:153)
at processing.app.debug.avrdudeuploader.uploadusingpreferences(avrdudeuploader.java:67)
at processing.app.sketch.upload(sketch.java:1671)
at processing.app.sketch.exportapplet(sketch.java:1627)
at processing.app.sketch.exportapplet(sketch.java:1599)
at processing.app.editor$defaultexporthandler.run(editor.java:2380)
at java.lang.thread.run(thread.java:619)

2. hit 1 time reset button: load led blinks 5-8 seconds it's off; ide not see serial port.

3. device manager shows (i attached print screen): bootloader com port grayed (showed if hit hidden devices option) , arduino leonardo com port seen. ide still not sees com port. however, have ide version called "arduino erw 1.0.5", sees com port, without load led on, cannot upload code; error on ide:

code: [select]
processing.app.debug.runnerexception: serial port 'com3' in use. try quitting programs may using it.
at processing.app.debug.avrdudeuploader.uploadviabootloader(avrdudeuploader.java:162)
at processing.app.debug.avrdudeuploader.uploadusingpreferences(avrdudeuploader.java:71)
at processing.app.sketch.upload(sketch.java:1716)
at processing.app.sketch.exportapplet(sketch.java:1628)
at processing.app.sketch.exportapplet(sketch.java:1600)
at processing.app.editor$defaultexporthandler.run(editor.java:2471)
at java.lang.thread.run(unknown source)

i have been reading many posts on internet. way can upload code on board pressing reset button until message "uploading..." shows on ide, wait 2-4 seconds , release button. code uploads on board, load led still off.

my questions:

does board have problems on loading code?
do wrong?
how can work clean leonardo, without having problems when upload code?

thank you, appreciated.



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