I downloaded ch40 and ftdi drivers for Arduino Uno but the port option is grayed out everytime. I cannot find any things on the web for this problem. I programmed the same Arduino Uno on a laptop and it was working fine!! I didn't Even installed any drivers in the laptop. But on my desktop computer, i installed every drivers but it's just not working!!!! Pls help
Me neither, it installs them automatically when I plug new board in
Yes, but I does not install and it does not work! I manually installed drivers but it does not work
Which operating system are you using @shloak_sansare?
Windows 10
Do you see a new device appear in the Windows Device Manager tree if you plug your Arduino board into your computer while Device Manager is open?
Yes it appears under "Other device" and it's name is other device
Please tell us which USB to serial adapter chip your Arduino board has. This is a black chip near the USB socket.
Examples:
The chip will usually be identified by writing on the top. This might say something like "Atmel MEGA16U2" or "WCH CH340G" or "SILABS CP2102" or "FTDI FT232RL".
OK, that is the ATmega16U2. Its drivers are in the drivers subfolder of the Arduino IDE installation folder. Try pointing the Device Manager driver installation wizard at that folder to see whether it will install the driver. After that, it should show up in the "Ports (COM & LPT)" section of Device Manager.
I did the same thing, but it says "Windows was unable to install drivers for your "Unknown device". And also now when I plug the Arduino Uno r3 and open device manager, it appears under the "Universal serial Bus" list. And my Uno r3 is shown as "unknown device(device descriptor request failed)" something like this is shown. The problem is getting worser. Pls help 
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