One thing I'll add if anyone else runs across this. I had run the samsung installer previous to seeing this video and was able to flash and root my phone. Everything seemed to be working (meaning I had access to my phone and could use the samsung updater just fine) but modem and adb? (I think its called that) were not recognized in device manager for me (I did not have any devices "not working properly" in the menu, they just weren't there at all).
So, I followed the instructions in the video, but when it came to connecting the phone, it would be recognized and fail to give me an "unknown device" option in device manager to allow me to manually install the drivers. What I did was disconnect the phone while the computer was establishing the connection and this caused "device not installed properly" error from which I could proceed with manual installation. After the first one, modem and adb then showed up and I was able to finish the installation process as per the video.
I suppose I could have just hit update driver in device manager and tried it that way, but as usual, it didn't occur to me until after I came out of WTF mode and everything was installed.
Excellent video friend. I never would have guessed the drivers were not loaded properly without seeing this. Glad I checked it out..