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Serial port com6 already in use

serial port com6 already in use

I'm 100 sure the usb-device is correct.
I bought an Arduino Uno recently.
I was editing a program, continously uploading and testing it, when I clicked the "Serial Monitor" button so I could debug (which had worked fine just minutes ago).
Instead of seeing that Blink, I received an error like rialException: Serial port w2 express pin help 'COM1' not found.
I'm suddenly having problems uploading/communicating with my Arduino board via the Arduino Java IDE.Yes, I tried that.Some say that it's because of my Acer Aspire 5742's motherboard.But even Serial Port Monitor doesn't seem opening.Some say that the reason is Windows.After I found out that my Serial COM ports don't work (via Portmon.After getting the necessary cables, I decided to upload an example to the chip.

My computer assigned COM Port 4 to mu Uno.
First I get a lot of weird char's, like you'd get trying to int a non-alphanumeric byte (although it was an int) - then, after fiddeling with the Serial rate from the IDE (while the Arduino program was still running I got an error.
Exe and figuring out that I may even don't have any (there is no COM port in Device Manager I also tried to download a driver for COM port, but it has also failed.
Long story short, I'd really appreciate if someone can help me with my COM port problem and mend my broken dreams).Below is the full error message.Did you select the right one from the Tools Serial Port menu?I've tried rebooting Ubuntu, reinstalling the software, removing all components and reprogrammed the Blink-example with my Windows machine (which worked - so I doubt the board is damaged).At at at at at at etch.