Shift + Right Click on folder C:\android-sdk-windows\tools, go to command mode option from there, and you should see it coming up with a command screen, type in adb devices with your phone plugged into the computer. If it shows your daemon is killing server, don't kill the window yet. Just wait...
It was meant to do this someway or whatever since I have a custom built PC for gaming and other purposes. I just didn't get the tech nerd answer right away for every problem solved, but it was all from you guys in XDA-developers, so I had this same error from trying to run 'adb' from start panel, and it didn't work because it was telling me my adb was needed to be re-installed and my AdbWinUsbApi.dll was missing from my folder, and It didn't tell me what folder, so I remembered my old way of learning how to run adb for the first time with my device.
Shift + Right Click tools folder from C:\android-sdk-windows as in C:\android-sdk-windows - Shift + Right Click RUN COMMAND PROMPT MODE. It should be fine after running this commands for your devices to show in the list.
adb remount - This is if your connected to a device already after.
adb install C:\android-sdk-windows\tools\setcpu.apk - example of your first apk file install.
Running the daemon killing server isn't gonna do anything to your phone like technically ruin it or trash it but its not, honestly, I never seen my phone ruined from this daemon killing server part, so if anyone cared to explained?