Where to find Arduino driver in folders?

On Windows, “Arduino driver” usually means the .INF file Windows asks you to browse to in Device Manager. Where it is depends on which IDE you installed and what board you have.

Arduino IDE 1.x (classic)

If you installed IDE 1.x with the installer/ZIP, the driver is typically here:

• C:\Program Files (x86)\Arduino\drivers (or C:\Program Files\Arduino\drivers)

• The INF you pick is usually arduino.inf inside that drivers folder.

Arduino IDE 2.x

IDE 2.x installs to (default paths):

• All users: C:\Program Files\Arduino IDE

• Only me: C:\Users\<you>\AppData\Local\Programs\Arduino IDE (AppData is hidden)

For many AVR boards, the driver installer files are stored under your Arduino15 package folder, e.g.:

• %LOCALAPPDATA%\Arduino15\packages\arduino\hardware\avr\1.8.6\drivers
  and Arduino’s forum instructions show running:

• ...\avr\1.8.6\post_install.bat to install the drivers.

If you mean “where Windows stores the installed driver”

Windows keeps installed drivers in the DriverStore, e.g.:

• C:\Windows\System32\DriverStore\FileRepository

(Usually easier: Device Manager → your device → Properties → Driver → Driver Details.)

Important note about clones (CH340/CP2102/FTDI)

If your board is a clone using CH340/CP210x/FTDI, the needed driver may not be in the Arduino IDE folders—you often need the USB-serial driver for that chip.