Uninstall Avast through the Programs and Features and then run the Avast Uninstall tool from Safe Mode
http://www.avast.com/uninstall-utility

Next:

Install and uninstall Norton IS and then run Uninstall tool
https://support.norton.com/sp/en/us/home/current/solutions/kb20080828154508EN_EndUserProfile_en_us?product=home&version=1

Next:

Download DDS and save it to your Desktop from here:
http://download.bleepingcomputer.com/sUBs/dds.scr

Double click dds to run the tool.

* When done, DDS will open two (2) logs:
    1. DDS.txt
    2. Attach.txt

Save both reports to your desktop. DDS.txt and Attach.txt attach back to topic.