Avast uses 70%+ CPU after installing software.

[usalabs14]

For some reason, I can't continue using the computer for at least 2 hours after installing software, because according to the task manager (which takes about 15 minutes to show up), avast service (32bit) is using in excess of 70% of the CPU (quad core), which slows the computer way down to a crawl and further use of the PC is halted, and each core temperature rises to around 56.6C (shown by core temp), and I have to try and use the Radeon catalyst controller to reduce the CPU speed down to around 800Mhz, from 2.8Ghz, which does reduce the temperature, but takes around 2 1/2 to 3 hours for avast to finish what it's doing.

When avast has done whatever it's doing, and everything returns to normal, I can then increase the CPU speed and return to using the PC as normal, but as soon as I install a program, avast then kicks in, and I can't use the PC for at least 2 to 3 hours, after reducing the CPU speed to lower the core temperatures.

I'm using:-

Windows 10 home premium (build 1803 x64) with all current updates.
AMD 2.8Ghz quad core APU
ATI Radeon 2GB VRAM GFX card
2TB HD
8GB system RAM

Why would avast slow everything down and use as much as 70% or more CPU resources?  Oh, and I almost forgot,,, the task manager does also show avast as using as much as 85% memory, spilling over to the swap file.

[bob3160]

Try the following:

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
If you need additional help with the Clean Install, watch this:
https://youtu.be/p-h3myRD51A
Report back if this fixes your problem or you need additional help.

[usalabs14]

I tried everything and anything including reformatting the entire PC and re-installing internet security suite, and just for testing, I installed Bluestacks, the moment it finished installing, Avast kicked in and suddenly the CPU usage shot up to 82% on all 4 cores and the memory usage got as high as 88%, along with the core temps reaching as high as 61.1C and shut down the PC due to overheating and so I had to lower the CPU speed through the BIOS, the HD light looks like it's fixed on, but I can just about see it flickering now and a gain, and I'm still waiting to use the computer and that was an hour ago, I'm using my laptop to post this message.

It's still that same service Avast Service 32bit is hogging the PC resources, if I can't get it fixed soon, I'll wait until my subscription expires and use another antivirus, and if for some odd reason, windows 10 does not like 3rd party antivirus software, then I'll just have to use the PC without one and depend on the built in MS security center, which is precisely what MS want people to do.

[bob3160]

I suggest you do this next:
https://support.avast.com/en-us/article/33/

[usalabs14]

I've already done that, but it could be months even years before a reply is received due to priorities, so I've decided to completely uninstall avast, (even though I have 108 days remaining on my subscription), and look for a better alternative, maybe AVG, or just rely on Windows security center.

From my experience with support teams with any software, a week or 2 is tolerable, but when people have to wait months even years, then it's time to find something else.

Thanks for everyone's help.