Hi Brian,
Did you upgrade to Windows 10 from a prior version of Windows? Or did you get a new computer OEM (Manufacturer Direct) with Windows 10 already on the system?
In EITHER case, if you went through the Windows Update to get Windows 10, or you get a new computer with Windows 10, make sure that you have completely removed Avast from the system. (Just disabling it will not work.) For example, all new Dells come with
a pre-installed version of McAfee Anti-Virus. A 12-24 month trial version. In order to get Windows Defender to work, and to resolve potential conflicts with two Anti-Viruses running in real time, you need to do the following:
1.) Go to Control Panel and check the list for any instances of competing AV programs. You have Avast, so you will need to uninstall it Uninstall Avast from Control Panel/Remove Programs. (Remove All Avast products. from the Control Panel Programs List.)
2.) Reboot your computer.
3.) Use the Avast Software Removal Tool. Here is the link to the removal tool for Avast from their website:https://www.avast.com/en-us/uninstall-utility This tool will find and remove traces of the Avast program that the uninstall program feature in Windows Control
Panel might have missed.
4.) Here is a link showing you how to boot into Safe Mode to run the Avast Software Removal Tool for both Windows 8 and Windows 10:
http://www.howtogeek.com/107511/how-to-boot-into-safe-mode-on-windows-8-the-easy-way/
5.) Get the tool and follow the prompts to run and remove any fragments of your AV that may still be on the computer.
6.) Reboot again.
7.) Future Tip- To help prevent going to a bad site in a web search, I use My Web of Trust or My WOT, which places color coded ratings next to web searches in site results. Green is good, Yellow is caution, and Red or Black is bad. You can also register with the My WOT community and leave your own ratings. It doesn't work with MS Edge yet, unfortunately. If you are interested here are details about the program:
https://www.mywot.com/
8.) Now after booting up, can you get into Windows Defender? If you can, update the Definitions and run a scan. It should find the Pokki software and remove it.
Jack