Step four: Once you have reached the System Recovery Options screen, as shown below, you will be faced with a list of choices that can aid you in repairing a damaged Windows 7 operating system. If you wish to try the Startup Repair option first, it is often successful in automatically fixing many different start up issues, but in this article we will be using the Command Prompt option to resolve our problems manually. So, click Command Prompt to continue.
If successful, you should be greeted with the message The operation completed successfully. That's it! Your Master Boot Record has been repaired. While the above command does fix the MBR, and sometimes that is enough, there still might be an error with the system partition's boot sector and Boot Configuration Data BCD.
This might occur if you have tried to install another operating system alongside Windows 7, such as Windows XP. To write a new boot sector, try the following command:. If you are still faced with your Windows 7 installation not being detected during start up, or if you wish to include more than one operating system choice to your system's boot list, you can try the following command to rebuild your BCD: bootrec.
The above command will scan all your disks for other operating systems compatible with Windows 7 and allow you to add them to your system's boot list. Upon purposely changing the active partition on my system drive, I was faced with a BOOTMGR is missing error during my system's start up that prevent Windows from starting.
It is a common mistake to make when playing with partitions on a system drive and it can be a headache to solve if not prepared. To change your active partition back using the Windows 7 recovery disc or Installation DVD, follow the steps below. Step one: Follow steps one to four in the above guide. Step three: Type List Disk now and then press Enter. This command will list all disks attached to your computer and assign them a disk number. Step four: Type Select Disk x , where x is the number for the disk containing the partition you wish to make active.
Press Enter. Step five: Type List Partition and then press Enter. You will now be shown a list of the partitions on the selected disk. Determine which partition you wish to make active. Step six: Type Select Partition x , where x is the number of the partition you wish to make active. Step seven: Now, just type Active and then press Enter.
That should be it - the selected partition is now active. Report abuse. Details required :. Cancel Submit. Dena B. Hi toastthemost, Thank you for posting to the Microsoft Windows 7 Community.
Please let us know if this helps. How satisfied are you with this reply? Thanks for your feedback, it helps us improve the site. This site in other languages x. This change is by design, and is intended to help reduce the overall disk footprint size of Windows. To recover a system with a corrupt registry hive, Microsoft recommends that you use a system restore point.
For more details, check this article. If the system gets stuck during the kernel phase, you experience multiple symptoms or receive multiple error messages. These include, but are not limited to, the following:.
For example, "0xC2" , "0xB" , "inaccessible boot device" and so on. The screen is stuck at the "spinning wheel" rolling dots "system busy" icon. If either of these options works, use Event Viewer to help identify and diagnose the cause of the boot problem. To view events that are recorded in the event logs, follow these steps:. In the console tree, expand Event Viewer, and then click the log that you want to view. For example, click System log or Application log.
On the Edit menu, click Copy , open a new document in the program in which you want to paste the event for example, Microsoft Word , and then click Paste. To troubleshoot problems that affect services, do a clean boot by using System Configuration msconfig.
Select Selective startup to test the services one at a time to determine which one is causing the problem. If you cannot find the cause, try including system services. However, in most cases, the problematic service is third-party. Disable any service that you find to be faulty, and try to start the computer again by selecting Normal startup.
For detailed instructions, see How to perform a clean boot in Windows. If the computer starts in Disable Driver Signature mode, start the computer in Disable Driver Signature Enforcement mode, and then follow the steps that are documented in the following article to determine which drivers or files require driver signature enforcement: Troubleshooting boot problem caused by missing driver signature x Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method.
These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved.
Modify the registry at your own risk. The ISO should be of same version of Windows or a later version. Under the following registry subkey, check for lower filter and upper filter items for Non-Microsoft Drivers:.
For each third-party driver that you locate, click the upper or lower filter, and then delete the value data. Search through the whole registry for similar items. Process as an appropriate, and then unload the registry hive. To fix problems that occur after you install Windows updates, check for pending updates by using these steps:.
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