To help further the question right before me, it is ill advised to install Avast on any PC that has another antivirus solution installed. Windows defender in Windows 8, 8.1, and 10 are exceptions to this rule, because Windows defender automatically gets disabled if another antivirus solution is installed devices running these operating systems.
If you have another antivirus solution installed, you should completely remove it, before installing Avast. Also, make sure all Windows updates are installed, before trying to install an antivirus. Some updates to Windows require app devs to make changes to certain apps that may effect their use, if those updates are not installed. Not sure how much this applies to Avast, but it's worth a shot.
Another question. you say this is a fresh install of windows 10. If this was from a Windows reset, did you have Avast installed before resetting Windows? This could be important for troubleshooting.