Contact avast and ask your money back for that horrible support.
Right now, I would say install Windows from scratch.
Who knows what else that wannabe ( not Wallaby
) tech has messed up.
- Format the drive
- Install Windows
- Install the latest drivers for all devices
- Create the user accounts that/how you want
- Install the applications that you normally are using (for all accounts)
- Make changes in the settings if you wish to do so (e.g. other background, font type etc)
- Put back data (if you want)
- Create a image of the drive
With the image you can restore a system in (depending on the speed of the system) 10 - 40 minutes.
Much faster than installing Windows and everything from scratch.