CPU problem after Anniversary Update on Windows 10

MerrilyInsane · 20 Sep 2016

Apologies if this problem has been addressed before.

On Sunday my laptop (bought new in May of this year) running Windows 10 Home 64 bit updated via Windows Updates to the Anniversary Update.
All seemed to go well but now my CPU is running at almost 100% all the time. From the searching I have done on the Internet I see I am far from being alone in experiencing this problem.
I am reasonably competent on computers for day to day stuff but this is a bit more technical for me. However I 'think' I may have found the culprit for this CPU problem but I don't know what to do about it and would appreciate help if anyone here knows how to fix this.
Looking in the Task Manager I see that there are 5 instances of the Windows host process (Rundll32) running in the background each using approximately 15% of my CPU which adding them all up is a fair chunk of my CPU. What are these processes and do I need them etc; etc; How can I get them to 'back off' so to speak and give me back my CPU.

Sorry if I am not expressing myself very well but hope you understand.

dalchina · 20 Sep 2016

Hi, sorry to hear of your difficulty. Some posts here related, not so many.

Here's one I found of my very earliest days with Win 10 which coincidentally may relate:
Solved CEIP - rundll32.exe high CPU use in Win 10? - Windows 10 Forums

If you are having difficulty controlling a rogue process gobbling CPU resources, try this unusual program, just as a temporary measure so you can use your PC and not run hot:
BES, Battle Encoder Shirase 1.6.2 (stable) 1.7.0-alpha: Controls Per-Process CPU Usage
It still works...

It could help if you can post a screenshot of your task manager showing processes with highest CPU use at the top, and identify what rundll32 is doing (see the first URL). You can then do a search using that.

Example for rundll32.exe aeinv.dll,UpdateSoftwareInventory
Windows host process high CPU usage - Microsoft Community

MerrilyInsane · 20 Sep 2016

Hi dalchina thank you for replying to me.

I had actually found that first link you provided before I posted my question and I followed the first part of the advice – that is to say I disabled the three items mentioned in the Task Scheduler Library but it didn’t appear to make make any difference. I’m not confident enough to dig around any deeper in the task schedular on my own.

I’m going to attempt to post a screen shot of my task manager and also a screen shot I took with Process Explorer in the hope it helps you to help me...lol

CPU problem after Anniversary Update on Windows 10-task-manager.jpg

CPU problem after Anniversary Update on Windows 10-process-explorer.jpg

dalchina · 20 Sep 2016

Hello, I don't actually have aeinv.dll in System32. It's present in Winsxs, but not an active part of my Windows installation. Neither is WUDFhost.exe

Basically what you need to do is search on each of the rundll32 strings, and identify something that matches your situation.
I'd just be doing those searches for you.

Searching for
rundll32.exe aeinv.dll.UpdateSoftwarelnventory
yields a good number of results.

MerrilyInsane · 20 Sep 2016

OK thanks very much I'll do that.