Avast using 100% CPU

Avast Free Antivirus / Premium Security
1

I have no idea what is going on but every once in awhile avast uses 100% of my cpu out of nowhere. I have to restart to get it to stop… Anyone know how to fix this? Is it a bug with Avast or am I getting hacked or something? I have had avast for a few years and never had this problem… Also, when I shut down my computer it says Welcome To Avast as I turn it off??? Very strange… I tried scanning for malware with malware bites and nothing comes up… and I obviously scanned for viruses with avast premium and still nothing…

Anyone know what could cause this?

2

I should also mention that I did in fact reinstall Avast to see if that would fix it… It seemed like it did for a few days and then it did the 100% cpu usage again.

3

Hi Aaron2, welcome to the forum :slight_smile:

What other security software do you have installed ?

We are also testing a new Beta version that fixes a lot of problems https://forum.avast.com/index.php?topic=166172.0

If you want to have your system checked for malware, follow this turtorial https://forum.avast.com/index.php?topic=53253.0
Than start a new topc here https://forum.avast.com/index.php?board=4.0 and attach the logs.
As soon as a specialist is online and available he/she will help you.

Greetz, Red

4

Problem with avast… multiple postsin the last 24 hours.

5

Look in taskmanager to see if there is a svchost running at 90+%
It there is use process explorer from Sysinternals (Microsoft), to see if dnsrslvr.dll is using it.
If it does, kill the process and the problem should be solved.

6

I have not had the issue today, but if it does it again i am just going to uninstall it and ask for a refund. I paid like 100 bucks for this and it has a bug that makes my cpu use 100%? That is scary. Also, if I have to uninstall my anti virus I will not be protected… that is also scary.

7

I have the same problem. Process AvastSvc.exe 100 pourcent … I restart my PC … It’s ok yet.

I have no virus or malware, troyen etc …

8

Aaron, it can very well be that avast is using that many resources because it is scanning something on your system.

What os/sp ?
What exact version of avast ?
Is a particular shield causing it ?

9

W7 64 bits prenium
Avast 2015.10.0.2208
Is a particular shield causing it ? : No

10

https://forum.avast.com/index.php?topic=166172.0
Perform a clean installation of the latest one and see if it solves the problem.