CPU Usage on 100% and CPU showing 1 core instead of 4 cores . Please Fix this Issue Immediately

Hi,

After I updated my windows 11 on 5/12/2022 the device has been really slow was having a lot of lag.

it is showing a 100% of CPU usage without doing anything all the time .

and the CPU is showing only 1 core instead of 4 cores.

kindly take this seriously and please fix the issue with windows

tried everything to fix it and i have been struggling with this problem for a month

I have done every troubleshooting option I could find in the settings but its showing everything is fine
and I tried to delete the specific update that started this problem and deleted but it keeps reinstalling the update.

the update is called "Update Stack Package - (Version 1022.1108.2012.0)" installed on 5/12/22