Well, the .exe is easier but it seems you've already tried that without success right? If so, let's try to go the more manual route. We'll use the zip file that has all the driver files inside. Here's the plan:
-Unzip the whole works into a regular folder on your desktop. You can either unzip it into a folder of the same name or make a new folder with a name of your choosing.
-Now while watching device manager, plug in the phone while in USB debugging mode. Note the device that pops up as a yellow exclamation point. Then, right click on that unknown device and choose the option to update driver > update manually with your a file of your choosing. (I'm paraphrasing there, can't remember the exact Windows wording). Then navigate to the new folder (not the zip) on your desktop with all the driver files inside. Choose the ENTIRE folder as the destination of your driver(s). Windows will search the whole folder for the correct driver so you don't have to select a single driver file inside.
-If all goes will, it will apply the correct driver for adb/fastboot usage which, in device manager, should then show up as "adb interface" (or similar wording).