Windows 10: Just updated to W10 now cpu at 100% all the time

I just updated my pc to windows 10 (version 1909) from windows 7, and according to the task manager my CPU is at 100% all the time. All 4 cores at 100% all of the time. The top CPU using processes vary but often include firefox, desktop window manager, and task manager.

The PC is not very new. I built it a few years back. It is built around an asrock p67 extreme4 gen3 motherboard and has a core i5 sandybridge cpu. I have a raedon hd 6850 video card, and several hard drives.

Oddly I have a program that shows cpu temp and all the cores are in the high 30deg C, so it seems like maybe task manager is wrong... wouldn't the cpu temp be higher if it were really using 100% for hours on end?

:)

 

Anniversary Update: Windows 10 CPU usage 100% All the time


So I disabled Defender and search indexing completely.

I did a clean boot minus TeamViewer because I have to use it to access my PC for now.









Cortana is acting normally.

Edit: here are a list of the details by CPU usage with Chrome open.

 

Anniversary Update: Windows 10 CPU usage 100% All the time

Great, I tried the program, and it removed lots of spyware and 1 more malicious piece of malware. Thanks. But sadly it didn't fix the problem. Still getting 100% CPU usage problems.

Thanks! I've taken out the two 4GB RAM sticks and left the two 8GB sticks there in the appropriate slots. Still having the 100% CPU usage problem. :/

I may just go for dalchina's suggestion and try that next. Thanks for all of the help and suggestions so far.

 

Anniversary Update: Windows 10 CPU usage 100% All the time


After reading the mobo manual its says if you use different size ram it must be of the same CAS Latency but for best performane use 4 identical rams as it makes no sense to me using different sizes





Also make sure your ram is install as the following picture suggests