Step 2) Open Advanced System Settings (A. S. S.)
Step 3) Click on Advanced if it is not already Selected
Step 4) Click on Environment Variables
Step 5) Under the System Variables section scroll down a little until you find "PATH" under the Variable column (the left side)
Step 6) Double Click on "PATH" and scroll to the very end of all of the other variables (you will need to scroll all the way to the right)
Step 7) You will insert (copy+paste) the path to the platform-tools directory and put a ; at the end of the previous path variable with no spaces anywhere!
An example of the path would look like"
;C:\sdk\platform-tools ^ Semi-Colon before the new path and at the end if you add something else
This is an example path and how you can get yours, just find where the adb/fastboot executables reside, usually inside the "platform-tools" directory
After this you will now be able to launch ADB/Fastboot commands from the terminal right from where it is when you open it.