Need assistance

I downloaded Arduino IDE for my windows 7. I installed it and tried to run Arduino IDE but it says that the chip is not connected at COM1 so I tried to change it but port option in IDE is gray(Can,t select it). So i tried to change it from COM and port in device management but a yellow mark appears under the Arduino's port and when I open its property ,it says error 32 in description. I would be very grateful if you could help me solve my problem. I am using Arduino uno, board model UNO R3.

Thank you

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