The following are some common Windows 7 and Vista errors that this guide can fix:
No bootable device – insert boot disk and press any key
NTLDR is missing or corrupted
Ntoskrnl.exe is missing
Ntsetect.com is missing
BOOTMGR is missing or corrupted
NTFS.SYS is missing
Hal.dll is missing
Troubleshooting and Fixing the Computer Can not Boot
Once the installation or recovery disks are loaded, if prompted, choose your language settings then continue. If you are using an installation DVD, when prompted by the following screen, select Repair your computer.
The computer will take a few moments now to scan itself for any Windows installation, after which you may be given the option of choosing which installation you want to repair. Select the appropriate Windows installation from the list and then continue. If by chance a problem is detected on one of your Windows installations at this early stage, the system may also ask if you can fix the problem automatically. It’s up to you if you want to let the system try to fix itself, but instead, select No.
Once you reach the System Recovery Options screen, as shown below, you will be presented with a list of options that can help you fix the corrupted Windows 7 operating system. If you want to try the Startup Repair option first, it often fixes many different startup problems automatically, but in this article, we will use the Command Prompt option to resolve the problem manually. So, click Command Prompt to continue.
Now in the command prompt, enter the following command and then press enter:
Bootrec.exe / FixMbr
If successful, you should be greeted with the message The operation completed successfully. There he is! Your Master Boot Record has been fixed.
Bootrec.exe / FixBoot
If you still face the installation of Windows 7 you are not detected at startup, or if you want to enter more than one choice of operating system to your system boot list, you can try the following command to rebuild your BCD:
Bootrec.exe / RebuildBcd
The above command will scan all your disks for other operating systems compatible with Windows 7 and lets you add them to your system boot list. If this fails, you may need to back up the old BCD * folder and create a new one in its place with the following command:
Bcdedit / export C: \ BCD_Backup
Attrib bcd -s -h -r
Ren c: \ boot \ bcd bcd.old
Bootrec / RebuildBcd
Some users also find simply deleting the boot folder and retrying the above steps effectively when resolving unbootable computer problems, but not recommended.
How to Change Active Partition
After deliberately changing the active partition on the system drive, I am faced with BOOTMGR lost due to errors when starting my system which prevents Windows from starting. This is a common mistake to do when playing with partitions on the system drive and this can make us headaches if no solution is found. To change your active partition again using Windows 7 recovery disk or Installation DVD, follow the steps below.
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- Type diskpart and press Enter.
- Type ‘Disk List’ and then press Enter. This command will list all the disks attached to your computer and give them the disk number.
- Type Select Disk x, where x is the number for the disk containing the partition you want to enable. Press enter.
- Type ‘List Partition’ and press Enter. You will now be shown a list of partitions on the selected disk. Determine which partition you want to enable.
- You will see a list that will display your system partition. Examples such as below:
Partition 1 OEM 39 MB
Partition 2 Primer 750 MB
Partition 3 Primer 297 GB <select the partition with Windows, which may be the first larger than 16 GB
Read more: How to Lock Any File in Laptop Windows 10
Type Select Partition x, where x is the number of partitions you want to enable.
Now, just type Active and then press Enter. That should be the currently selected partition active.
That’s the discussion on this opportunity about the computer cannot boot and how to solve it. Maybe useful.