Manual installation of Arduino IDE drivers on Windows

To install manually the drivers of an Arduino boards on Windows follow these steps: 
- Connect the board to PC via USB cable. 
- Select Device Manager>Ports(COM & LPT). 

Windows Device Manager 

- Click on your board. 
- Select the field: Driver. 
- Click on: Update Driver. 

Driver Details menu 

- Choose the label: Browse my computer for driver software. 

Browse my computer for driver software 

- Select the option: Let me pick from a list of device drivers on my computer. 

Browse for driver software on your computer 

- Click on: Have Disk. 

Select the device driver you want to install for this hardware 


- Select: Browse. 

Select Arduino 1.7.x>Drivers folder 


- Indicate the folder "Arduino 1.7.8>Drivers>Arduino-org.inf" and click on su Open button. 

Select arduino-org.inf file 


- Click: OK. 

Confirm the selection 


- Go: Next. 

Install the driver 


- Wait installing driver software. 

Driver installation 


- Completed the installing driver it will be shown this image: 

Driver installation completed 


NOTE:
If you aren't using the Arduino Uno then you must repeat the previous procedure but in bootloader mode. 
- Open Device Manager. 
- Click one time if you are using a board with Microcontroller ATSAMD21G18A (Arduino M0/M0 Pro/Zero) or two time if you are using a board with Microcontroller ATMEGA 32U4 (Arduino Yun/Yun Mini/Micro/Robot/Esplora/Leonardo) on Reset button. 
- Now it will be appears on Device Manager an Unknown Device. 
- Select this device and to install manually the driver following the previous procedure shown in this guide. 
- Wait the completion. 
- Close the Device Manager . 
- Now you can open the Arduino IDE to upload the sketches on your board; remember to select the correspondent Port andBoard when using the Arduino IDE. 
Warning:
If you have followed the guide but you have still the drivers issue, then try to Disable Driver Signature Enforcement following this other guide: 
Guide to Disable Arduino IDE Driver Signature Enforcement for Windows