I have problems with internet secutity , still uses the processor 40/50 % of all the time it can be the cause ? I can be original license and prove
Perform a repair and see if it makes a change.
Reboot after doing so.
If it doesn’t make a change, perform a clean installation and check again.
Repair Avast:
Control Panel> Program and Features (Add/remove program)>Select Avast> Select Repair. Reboot when completed
https://www.avast.com/faq.php?article=AVKB204
If Repair doesn’t fix the problem, try the following:
Clean Install of Avast:
https://goo.gl/4Ptzkf