system
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If you decide to do a reinstall or not of Avast, download the removal tool & Avast save to desk top.
Go into safe mode use the uninstaller making sure you chose the right Avast version at top.
Once uninstalled do a search for any Avast left over, also there will be empty Avast folders in Regedit, you can delete them. Under Current User & Local Machine
Disconnect from internet & reinstall Avast.
I don’t know if you noticed there were more Avast files in Drivers.
But using the uninstaller should clean them up.
Glad you got up & running good luck.
http://www.avast.com/uninstall-utility.