News, tips, advice, support for Windows, Office, PCs & more
Home icon Home icon Home icon Email icon RSS icon

We're community supported and proud of it!

  • Problems with Windows \System32\cmd.exe

    Home Forums AskWoody support Windows Windows 10 Windows 10 version 20H2 – October 2020 Update Problems with Windows \System32\cmd.exe

    Viewing 4 reply threads
    • Author
      • #2371550
        AskWoody Plus

        Good Afternoon All

        For the past day or so I have been getting random flashes of a small black box on my Desktop PC screen causing the opening of a Settings page of Default apps – sometimes with Thunderbird e-mail client highlighted, sometimes not.

        The box is so quick that it is difficult to read but I think that the title across the top says:-

        “C:\Windows\system32\cmd.exe”   but that may not be exactly right.

        I can then close the settings page and continue using the computer normally until the same thing happens a few minutes later – this process then repeats for the time the PC is used.

        The only thing I have changed recently was to install Thunderbird and in conjunction with that I downloaded and installed a program called PuTTY Suite when following instructions relating to checking e-mail compatibility between Thunderbird, and my ISP account Plusnet e-mails.

        I have now uninstalled PuTTY suite and also done a system restore to before that installation.

        Don’t know if it is relevant, but my “About” page in Settings is currently not responding.

        I am not very computer literate and am now completely stumped as to how to solve this problem – please can somebody help me?

        Thanks and regards,


        PS. OS is Windows 10 Home 20H2 – June Windows updates not yet installed.

      • #2371579
        AskWoody MVP

        Does Settings, About still not work after restarting the computer?

        Windows 10 Pro version 21H2 build 19044.1151 + Microsoft 365 (group ASAP)

      • #2371592
        AskWoody Plus

        After restart Settings, About now responds.

        Settings, Security had also stopped responding before the restart – now OK after restart.

        May be coincidence, but immediately after restart all seemed to work OK but as soon as I opened Thunderbird email client the Settings, Default page was triggered following the sudden flashing black box.

        Perhaps Thunderbird is the real culprit here – wish I knew how to disable it somehow in order to check.  Can you help with that.

        Incidentally, why do you think the non-responding settings became responsive again after the restart.

        I’m not very knowledgeable with computers I’m afraid.

        Thanks for your interest and help.

      • #2371600

        This could be a scheduled task or background app, maybe the tutorials on viewing Autoruns will help.

        Most people can use Thunderbird without PuTTY Suite.  Here are full removal instructions


      • #2371965
        AskWoody Plus

        anonymous – many thanks for your reply.

        Sorry to be delayed in responding, but the automatic e-mail notification from the forum to me hasn’t worked on your post and so I have only just now (17.6.21 14:39 UK time) seen it.

        I will now follow the links you have given to me and come back later to let you know how I have got on.

        Thanks and regards,


    Viewing 4 reply threads

    Please follow the -Lounge Rules- no personal attacks, no swearing, no politics or religion.

    Reply To: Problems with Windows \System32\cmd.exe

    You can use BBCodes to format your content.
    Your account can't use Advanced BBCodes, they will be stripped before saving.