Avast Free Antivirus is not openning

[Zaur_B]

Hi,

Avast stopped opening the app on Windows and started to consume a lot of CPU capacity, increasing the CPU temperature and running the fan like crazy. I have tried to repair the antivirus but that didn't work. I then did a clean uninstall and re-installed it but the issue persists.

What can be the cause of it?

[bob3160]

Hi,

Avast stopped opening the app on Windows and started to consume a lot of CPU capacity, increasing the CPU temperature and running the fan like crazy. I have tried to repair the antivirus but that didn't work. I then did a clean uninstall and re-installed it but the issue persists.

What can be the cause of it?

Please stick with your topic on the Mac forum.  More posts only add confusion. Thanks

[Zaur_B]

I was asked by the Avast team member not to ask questions about the windows version in the mac forum and post separately.

[bob3160]

I was asked by the Avast team member not to ask questions about the windows version in the mac forum and post separately.

Sorry but posting in the non Mac (Windows) version isn't going to get you help with your Mac problem.

[CraigB]

I was asked by the Avast team member not to ask questions about the windows version in the mac forum and post separately.

Sorry but posting in the non Mac (Windows) version isn't going to get you help with your Mac problem.

Bob, The OP is using Windows.

[bob3160]

I was asked by the Avast team member not to ask questions about the windows version in the mac forum and post separately.

Sorry but posting in the non Mac (Windows) version isn't going to get you help with your Mac problem.

Bob, The OP is using Windows.

Then I guess his first post was the incorrect one since it was posted on the Mac forum.
@Zaur_B,
Have you restarted your system since doing a clean install?

[Zaur_B]

Yes, I restarted the system, but the problem persists. I still can't open Avast, and Avast is loading at least 20% of the CPU's capacity with very high power usage. When I open any media files or even a browser, the CPU capacity load from Avast increases, and the fan starts spinning loudly.

[Zaur_B]

Further update on the situation. I decided to uninstall Avast, given no solution to the problem was found. I installed AVG and faced the same issue. High CPU usage and not being able to open the app/programme. I guess there are a lot of similarities between these two anti-viruses as they are owned and developed by the same company since 2016.

I then found this post by Microsoft about high usage of CPU by certain programmes, often antiviruses. https://learn.microsoft.com/en-us/troubleshoot/windows-client/performance/lsaiso-process-high-cpu-usage

My technical knowledge is not that deep to understand this post from Microsoft and do anything about the problem. Still, I thought I share it here as someone may find it useful.

[bob3160]

Avast purchased AVG some years back. The main difference between the two products
is the user interface.
More information about your system would be helpful, Processor, ram, how old?
What AV was installed prior to Avast? How was that AV removed?

[Zaur_B]

Here are some details of my PC:
System Manufacturer: HP
System Model: HP Z2 Mini G4 Workstation
Processor   Intel(R) Core(TM) i7-9700 CPU @ 3.00GHz   3.00 GHz
BIOS Version/Date   HP Q50 Ver. 01.08.02, 30/03/2022
Installed RAM   16.0 GB (15.8 GB usable)
System type   64-bit operating system, x64-based processor
OS Name: Microsoft Windows 11 Pro
Version: 10.0.22621 Build 22621
GPU: NVIDIA Quadro P1000

I purchased it about 2.5 years ago.

No antivirus was installed before Avast. I installed Avast shortly after I purchased the PC and it worked well until recently.

Let me know if any additional info can be helpful.