There are two mechanisms in place that controls how the Windows system can be booted:. Before Windows can be booted, its boot loader needs to be found. The Windows boot loader is part of the Windows operating system, which is responsible for starting Windows. Keep in mind that the MBR as well as the VBR boot code executes in real mode as bit instructions, so there are no protection mechanisms in place.
After the protected mode has been loaded, another boot manager is loaded into memory, which actually boots the Windows operating system. This is why the NTLDR program is used to switch to the protected mode and execute the protected mode boot manager.
Once the NTLDR is executed, it must access the file system on the boot drive to access the files that it needs. It first tries to find the hibernation file hiberfil. If the hibernation file is not found, it reads the boot.
After that, the Ntdetect. Finally, the Ntoskrnl. The picture below shows the contents of this file:. We can take a look at all the options we can enter into the boot. On the picture below, we can see the contents of the MBR, dumped with dd and find Linux commands:. Notice that there are two partitions and that the first one is active: this is the partition where the Bootmgr is located. Notice that the Bootmgr file is present on the picture above?
This is the file that gets loaded into memory and executed, which boots the Windows operating system. Keep in mind that Bootmgr is still a bit program, which must be used to switch from real to protected mode. The whole booting process of newer versions of Windows operating systems can be seen on the picture below, which was taken from [2]:. The boot loader located on that partition then loads the bit Bootmgr, which in turn loads the bit Bootmgr, which then loads the winload.
All of them are then used to load the NT kernel. The Bootmgr must also load the configuration files located in the D:Boot directory.
The picture below lists all the files in it:. In Windows, we can use the tool bcdedit. The picture below shows the Windows boot manager and Windows boot loader, which are displayed if we run the bcdedit.
When booting the operating system, all of the Windows Boot Loaders are displayed to us and we can choose the one we would like to boot. If only one boot loader is present as on the picture above , then the screen presenting us with the options to boot from is never shown, because the only option is used.
What are the system recovery options in Windows 7? If nothing works you can do a repair installation. Use these methods to replace the registry with a backup. Boot with a Windows 7 disk. Both of the below accomplish restoring a registry backup.
Was this reply helpful? Yes No. Sorry this didn't help. Thanks for your feedback. I have a Windows 7 laptop that will not boot up Windows. After the Windows loading bar, it will remain on a black screen with the cursor and that's it. It will give the same blank screen each time. This thread is locked. When the "computer won't boot Windows 7" issue happens to you, you can try the following methods to solve your problem.
It's very likely that the battery is drained. If you are sure the power is enough, then the cause may be the hardware components like PSU and motherboard. Sometimes, the "Windows 7 won't boot" problem is caused by PC overheating. In this case, you can wait until the PC is cooled down and then try starting this PC again. If this problem is caused by overheating, I recommend you to consider replacing the cooling system.
Are you worried about computer heat? Do you want to get rid of CPU overheating or graphics card overheating? Here are some things you should know about. Have you connected some external devices to your PC? Have you added or replaced some hardware components in your PC? It's also possible that the "Windows 7 won't boot" problem is caused by these devices, if these devices are incompatible with your PC and interfere with the normal boot process of Windows. Therefore, please remove these devices to see whether the problem is solved.
These external devices include: printers, scanners, media card readers, small media cradles iPod, PDA, MP3 player, etc. Many people may like to overclock their CPUs and Memory components, especially gamers. However, do you know overclocking may reduce the stability of accessories and shorten their service life?
Sometimes, Windows 7 won't boot, just because of improper overclocking. To solve this problem, you can disable the overclocking. If you use software for overclocking, uninstalling the program can solve the problem. If you use BIOS settings for overclocking, please refer to the following brief tutorial to disable it:. Is Overclocking Safe? Whether to Overclock or Not? Look Here. Here are 3 ways to access Startup Repair:.
If the Startup Repair can't solve the "computer won't boot Windows 7" problem, you can try other Windows 7 repair tools.
If the RAM bar has something wrong, the Windows 7 also won't boot. Please check memory for errors. Please pay attention to its Status to see whether there are errors detected. If it detects errors, you should search online for solutions, or you should replace the RAM with a new one. If some system files are corrupt, causing Windows 7 not to boot, you can use SFC command to repair these system files.
Here is the guide:.
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