If you agree, I would like to check your system on malware.
It is possible that a some malicious activities in the background affected on avast although avast’s self defense module should protect him but let’s check anyway …

Please download DDS and save it to your Desktop from here:
http://www.bleepingcomputer.com/download/dds/dl/104/

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.