While this scenario doesn't match what you're experiencing, there is good reason to uninstall Avast and Reinstall the current version.
[fixed] Blue Screen (BSOD) - Windows 10 Anniversary Update on Skylake CPU
What happened (in detail)?
On Tuesday, August 2, Microsoft released their latest version of Windows 10 - the Anniversary Update - via the Windows Update channel. While the majority of our users didn’t have a problem, certain HW configurations didn't mix well with the update. To be specific, when the Windows 10 Anniversary Update was combined with our aswvmm.sys driver on an Intel CPU from the Skylake family with Intel® Virtualization Technology (Intel VT) enabled in the BIOS, the update resulted in a BSOD. This occured during upgrades to the Windows 10 Anniversary edition from previous versions of Windows, and during clean installations of Avast Antivirus on systems already running the Anniversary Update.
Avast FAQ | Avast Antivirus: Preventing a BSOD when installing the Windows 10 Anniversary Update
A lot of of issues are resolved by installing current 3rd party software.
Run Belarc Advisor
to produce an audit of your machine, then check software vendor sites for more recent versions. Belarc should provide the software keys if you need to clean re-install the application software.