Windows 7 very slow - CPU strikes 100% RRS feed

  • Question

  • Hello,

    We have around 100 old computers running Windows 7, the hardware is a bit old, the the machines should have enough power to work on Windows 7.

    One month ago, the KB4499175 and KB4499164 have been installed on all computers, and soon after, the performance decreased considerably and the CPU is almost constantly at 100%.

    The RDP was disabled via GPO and the Windows updates uninstalled, there was an improvement in the Windows performance, but it did not returned to the original state and the CPU is still high.

    We have tried different solutions, updating the antivirus, computer clean up, only the necessary programs and services were kept, but the computers are still slow.

    Does anyone has any suggestions?

    Thank you


    Tuesday, June 18, 2019 1:26 PM

All replies

  • Hi,

    1. To troubleshoot whether the issue is related to a third party service, please check the symptom in a clean boot environment.


    2. Check which process is cpu high in task manager.

    3. Refer to the following article to Optimize Windows for better performance.


    4. Follow the steps below to delete update cache files:

        Run command as administrator and run 

         net stop wuauserv

         Ren %systemroot%\SoftwareDistribution SoftwareDistribution.old      

         net start wuauserv

    Best regards,


    Please remember to mark the replies as answers if they help.
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    Wednesday, June 19, 2019 3:30 AM
  • Hello "o DreaMeR o", 

    [EDIT: One opens the Windows Task Manager with: Ctrl+Shift+Cancel.]

    You can use Resource Monitor to identify what applications are using the CPU and what load they cause.

    You can also do this from Windows Task Manager > 'Processes' tab > click on "CPU" (and if necessary click on "CPU" again so as to have the high usage applications shown at the top of the screen).

    If you boot up the machine and then open Windows Task Manager by doing: Ctrl+Shift+Cancel (Esc) > 'Processes' tab you can see what applications currently load with Windows.

    Not all of these applications may be necessary to have loading with Windows.

    To disable an application from loading with Windows, you can open the application in question and look in its "Preferences" or similar dialog for an option such: "Start when Windows loads" or similar, or, you have the option to instead uninstall that application.

    Remember, if you still need the application and don't need it to start with Windows, you still have the option to manually start it.

    Never disable security applications from starting with Windows but with the following reservation: 

    Do not have more than one anti-virus application loading with windows since having more than one running will cause an unnecessary load on the System. 

    With Resource Monitor you can disable straight away (until next reboot) individual applications, and so be able to assess immediately any performance change. Some applications such as antivirus may be protected and if so, cannot be disabled: "Access denied".

    Of course disabling security is not normally appropriate - see above.

    To open Resource Monitor do:

    Start/Search: Type:


    and press “Enter”.

    You can also open Resource Monitor from Performance Monitor:

    Start/Search: Type:


    and press “Enter”/

    ‘Performance Monitor’ dialog box:/

    Ensure “Performance” parent category is selected/

    ‘Overview of Performance Monitor’ section:/

    Click: “Open Resource Monitor” Link.

    If you identify any non-essential application(s) causing a load on the System, you have the option to uninstall that application(s).

    See also Yilia's answer above for methods of Optimizing Windows.

    I hope this helps.


    • Edited by Robert339 Wednesday, June 26, 2019 6:15 AM
    Monday, June 24, 2019 6:08 AM
  • Hi,

    Is there anything I can do for you?

    If you have any problems or concerns, please feel free to post here. 

    Best regards,


    Please remember to mark the replies as answers if they help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Tuesday, June 25, 2019 6:28 AM
  • Hello Akshay,

    I appreciate your post. I didn't know that. Sincere thanks!

    One other useful function of the Windows Task Manager (valid until either manually changed, or the computer is restarted), is as follows:

    Open Windows Task Manager, by doing:
    Ctrl + Shift + Cancel (Esc)

    Open its 'Processes' tab:

    If you have been seeking to carry out a function (a download for example) and the function has been proceeding rather slower than expected, a temporary fix is to right-click the process you would like to get higher priority, and do:

    Set Priority > High > Change Priority


    Do NOT choose the option: "Realtime": Doing so may cause System instability.

    When you try increasing the Priority on a particular process, do you receive the message: "Access Denied"?

    Here is a tip for that instance:

    Go though the list of other NON-essential processes, and set each to : "Below normal" !

    When you do that, in effect you increase the priority of the process that had returned "access denied"!

    When you need to identify the process that you want, you may find you can do so, by doing:

    Open the Task Manager 'Applications' tab:

    Right-click the desired listed application > Go To Process:

    The 'Processes' tab opens with the Process for that Application selected.

    Any such Priority changes are not saved upon reboot.


    Robert 339

    • Edited by Robert339 Wednesday, June 26, 2019 6:17 AM
    Wednesday, June 26, 2019 6:11 AM