problem with download

hello , i am new here >D ... a bough a new arduino uno a install the softwear and I try do doing the programs, everything was good, but i can't the dovnload the program to arduino, I have the computer with 3 usb but, i haven't the COM port , i my device manager isn't the COM port , what can i do ?

You may have to install the serial driver. That's step 4 of the installation guide for Windows:

i my device manager isnt the hardwer that computer didnt not recognize for witch can i install the drivers ... for example in this case like here : but i my device manager isnt the com ports and isnt the not recognize ports. And when i plug the arduino to my computer it doing nothing ,my computer begins to not recognize the device.

please help ... :(

i havent com ports on my computer...