Windows 10: CPU goes up to 100% after updating to Win 10

  1.    12 Nov 2015 #1

    CPU goes up to 100% after updating to Win 10

    Hi guys,

    Would appreciate any help at all. Thank you very much. After updating to Win 10 recently, I realized that I was lagging everytime I run some games. Even exiting them, it would still continue to mess up my CPU with heavy usage. With 16GB of ram this shouldn't happen. While in game, there was heavy graphic lag. I turned off all my additional programs in the background, did scans of CCleaner and my Anti virus. I also cleaned up registry with CCleaner.

    Did some research previously and also turned off all the Customer Experience Issues in the Task Scheduler. This issue still happens every now and then. How do I check what exactly is the rundll32.exe is coming from?

    Click image for larger version. 

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    Could it be a hardware issue? Fans clogged up or is it purely a software issue? Any help would be greatly apppreciated. Thank you for your time. :)

    i7-3770 @ 3.4GHZ
    16GB Ram
    Motherboard: MSI Z77MA-G45
    64-Bit Win10 Home Edition
    GPU : AMD Radeon R9 200 Series(I believe it should be the 270)
    500Watt power supply
      My ComputerSystem Spec

  2.    15 Nov 2015 #2


    This problem only happens around midnight onwards..It seems there is some kind of thing updating maybe? Could it be a malware?

    I have turned off Windows Defender, windows update, etc...Nothing in the task bar is running (antivirus/etc)

    Is there any program or solution that I could enable to see what exactly are the rundll32.exe that are running?

    Any help is appreciated..Thank you very much.
      My ComputerSystem Spec

  3.    15 Nov 2015 #3

    You could try Process Explorer.

    Right click on the process, select properties and then look into the image tab. That should tell you what it is doing.
      My ComputerSystem Spec

  4.    15 Nov 2015 #4

    Check Task Scheduler for anything that starts around midnight. Might give some indication as to the cause.
      My ComputersSystem Spec

  5.    16 Nov 2015 #5

    How to Determine the Parent Process of a Running Process in Windows? - The Winhelponline Blog
    - might help to identify the parent process which launches rundll32.exe
      My ComputerSystem Spec

  6.    16 Nov 2015 #6

    I was experiencing very similar problems just like you last week. I do graphic design work and my graphics programs were giving me the old..."Not responding" message with the activity indicator just spinning. I was having serious lag issues noticing that my 6 gigs of memory were almost reaching their limit just doing some simple rendering in Photoshop. So, I decided to followed many suggestions on doing a clean re-install of Windows 10 and now all previous problems are GONE! I then added another 12 gigs of memory after the re-install and my system is really running great! Maybe you need to do the re-installation so Windows 10 runs lean and clean.
      My ComputerSystem Spec


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