It sounds like your drivers are fine
Are you trying to use ADB with the Android SDK or are you using it for running commands etc...
If you are using ADB to run commands and ADB isn't installed as a recognized command ( universal installation )
then you'll need to run
adb in it's directory.
Unzipping Easy ADB V1.zip will give you a few versions.
Double click on Open Me.bat to start a command window using the desired option, this is a simple batch menu to start a command window in the desired directory, right click and edit it to customize the colors etc....
Make sure your device is recognized as Android Composite Device etc....
adb devices from the command window you opened.
If you've chosen the Auto Authentication version, you'll need to accept the connection on your device.
Sometimes you will need to do this on the normal version as well. ( it's just an old version )
Hope this all helps simplify the process ...
Using the SDK
You should only download the entire Software Development Kit if you actually plan on developing software...
It should automatically use the correct directory in Android Studio, without modifications.
I personally use the Easy ADB files - I just slapped the .BAT file together to make easier for beginners to navigate without using