It seems we are at least three persons to have the following problem :
- avastsvc constantly uses 25% (on quad core CPUs) or 50% (on dual core CPUs) or more
- trigger unknown
- the machines on which this is happening are hosting windows 7 (specifically SP1?)
- concerns 9 to 17 avast versions (please confirm?)
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please report here if you are concerned too : give us you OS, avast version, symptoms
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As for today, it seems to me this is triggered after a VPS update :
- we are three win7 users experimenting the same thing around the world
- after a factory reset from my whole system (2013 image) and an avast 9 offline install nothing happens with the CPU
- then with an offline VPS update (2021.08.27 virus bases) the CPU goes up after x minutes (trigger unknown)
I do hope this problem is not a trick to push "old systems users" to upgrade.
TEMPORARY SOLUTION - STAY WITH AVAST 9 TO 17
Restart avastsvc with a file to make it use 0% CPU again (until it goes high up again...) :
- create a text file anywhere
- write inside the file EXACTLY this and save it :
net stop "avast! Antivirus"
net start "avast! Antivirus"
- rename the file "restart.bat"
-> executing the file will stop then start the avast service
DEFINITIVE SOLUTION
- update to avast 2021 : see official avast website - maybe a win7 update is necessary
- update to avast 2019 or 2020 : to download google "site:filepuma.com avast 20[number]"
- hey wait, avast 2019-2021 kills my weak old netbook...
hi thanks i created an account just to say i was trying hard to figure out why my cpu fan was working so hard constantly 100% cpu utilization on 1 core. thanks for creating this post making me feel that im not the only user that is facing this weird issue.
Windows 7 sp1 with avast 9.0.2021 and 10.4.2233
even after using avastclear and reinstall avast 9.0, upgraded to avast 10.0 didnt fix the issue.
disable rootkit scan fixed it thanks! most likely something in that 25AUG update triggered something else why have we been using it no issue for years?
couple of days ago i disabled rootkit scan, now i tried to enable rootkit scan again on my desktop, i cant seem to reproduce the issue!
i have a laptop my dad uses that has rootkit enabled all along and does not have cpu hog issue, not sure why?