Quick Guide On How You Can Fix Your Computer That Won’t Boot

The following guide will solve the errors stated below in windows 7 and vista:

  • exe is missing
  • NTLDR is missing or corrupted
  • com is missing
  • SYS is missing
  • BOOTMGR is missing or corrupted
  • dll is missing

Follow these steps to fix a computer that does not boot

Step 1: Start your windows computer, boot the system using windows 7 Install Disk or you can also use the System Recovery disk. Keep in mind that you need to change the boot order from BIOS so that your disk drive boots first.

Step 2: When the recovery or installation disk loads, follow the options that are shown on the screen, select repair your computer options to continue.

Step 3: The computer will scan for any installation that needs to be done, after that you will be given the option to choose which type of system repair you want to do. Select the desired windows repair option to continue with the installation process. If your system detects any problem that can be repaired automatically, it will ask you to choose continue with automatic repair or you can continue further by pressing no.

Step 4: When you have reached the recovery option screen, you will see a list of many options that can help in repairing the Windows OS. Start up option has high rate of fixing the windows so choosing the Start up repair option first is a good choice. There is another option to repair the windows that is by using the command prompt option. In this article, we will cover the steps using command prompt. So your next step is to select the command prompt.

Step 5: When the command window is open, execute the command given below –

bootrec.exe /FixMbr

When the command is successfully executed, you will be greeted with a message saying ‘The operation completed successfully’.

Great job, you have repaired your Master Boot successfully.

Fixing the MBR error does the job but sometimes you can get an error related to Boot configuration Data and System Partition data. This error occurs when you try to install another OS alongside windows 7.

For writing the new boot sector, execute the following command:


If you want to install more than one OS to your system, try executing this command to build the BCD:


The command shown above will scan your disk for the OS, which are compatible with Windows 7 will be added in your system boot list. If this method fails, then you have to try and create a backup of the old BCD folder and create a new one in its place by entering the command given below-

Bcdedit/export C:\BCD_Backup


cd boot

attrib bcd –s –h –r

ren c:\boot|bcd bcd.old


Note: deleting the boot folder and installing it again by following the above steps can also resolve the issue but it is not at all advisable.

Steps to changing the Active Partitions

When I changed the active partition on my system drive, I encountered a BOOTMGR is missing error which prevented the windows from starting. This is a common mistake that we make when we purposely change the active partition. You can easily change the partition using the windows 7 installation or recovery disk, just follow the steps shown given below

Step 1: Repeat the steps from 1 to 4 from above which will take you to the command prompt.

Step 2: Write DiskPart and press enter to continue.

Step 3: Write ListDisk and again press enter. You will be able to see the list of all disks that are attached to your system. Each disk is assigned a number. To make a disk active type Disk x (x is the number assigned to the disk). Press enter to continue.

Step 4: To get the list of all the partition of a selected disk, write List Partition and press enter. Here you can select which partition you want to make active.

Now, you will be able to a list of your system partitions.

(Example list)

Partition 1 OEM 39 MB

Partition 2 Primary 750 MB

Partition 3 Primary 297 GB   < select the partition with Windows, which is probably the first one larger than 16 GB

Step 5: To make a partition active, write Select Partition x (x is the number assigned to the partition)

Step 6: The final step is to activate the partition and to do that Write Active and press enter. This will activate the selected partition.

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