Very slow boot and MBR error 3 linked?

  1. Posts : 6
    Windows 10

    Very slow boot and MBR error 3 linked?

    I have recently upgraded my desktop with a SSD drive and 8 Mb of memory. However, the PC still seems very slow and sluggish at times especially on start up which is glacial speed. I also get an error "MBR error 3" showing up constantly. Can anyone advise me if I am right in assuming that the two problems are linked?

    My boot drive, C:, appears in the attached screen shot as drive number 3. Is this anything to do with it?

    Thanks in advance.

    Very slow boot and MBR error 3 linked?-crofter-parttitions-17-dec-17.jpg
      My Computer

  2. Posts : 6,963
    windows 10

    You have a strange arrangement normally you have the boot disk as drive 0.

      1. Insert the installation USB and boot Windows 10 from it.
      2. In the ‘Windows setup’ page select the ‘language to install’, ‘Time and currency format’ and the ‘keyboard or input method’ and click on ‘next’.
      3. Click on ‘Repair your computer’ and select ‘Troubleshoot’.
      4. Click on ‘Advanced options’ to get into Advance repair menu.
      5. We need to use the Bootrec.exe tool. Click on command prompt and type in the following commands, one after the other.
        • bootrec /RebuildBcd
        • bootrec /fixMbr
        • bootrec /fixboot
        • Exit

      6. Now, restart your computer and check.
      My Computer

  3. Posts : 6
    Windows 10
    Thread Starter

    Good morning Samuria, thanks for the advice which I will be putting to use later today. Unfortunately I do not at this point have an installation USB or CD but I have ordered a 64 GB USB stick which Amazon will deliver later today. The max size I have of sticks are old 2 GB so it is time I updated them all.

    I will let you know how I get on.

    Thanks again, Frank
      My Computer

  4. Posts : 5,478

    To save waiting for your USB you should be able to boot into recovery console by holding shift and clicking on restart.

    Boot to Advanced Startup Options in Windows 10 Installation Upgrade Tutorials

    Then you can start at point 3 on samuria's list
      My Computer

  5. Posts : 6
    Windows 10
    Thread Starter

    Hi Folks

    Carried out the steps recommended by Samurai. Only problem came when I tried bootrec /fixboot and got an error message denying me access. However, my pc is running better but I seem to have two OS installed now Windows 10 (first option on the blue start screen which it defaults to after 30 seconds or so) and Windows 10 Pro which is the second option and does not appear to work. I originally purchased windows 7 Pro and upgraded to ten pro so not sure what has happened.
    Anyway, it is running much better and the "MBR error 3" no longer appears so I am tempted to just leave it as it is unless there is a quick and easy way of getting rid of one of the two options on the blue screen.
    Would it matter if I just left it as it is?
    Thanks again folks for your help.
      My Computer

  6. Posts : 158
    Windows 10

    Is Windows 7 still installed or does it just show up in the boot manger. You can doenload the following utility and check or change your boot configuration if that is only issue
      My Computer

  7. Posts : 5,478

    Are you booting in legacy or csm or what?

    7 is a bugger booting EUFI
      My Computer


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