When you are using Windows operating system, sometimes you may get an error message like “Error loading operating system, bootmgr is missing press ctrl+alt+del to restart”, “Operating System Not Found”, “Missing operating system”, “Reboot and select proper boot device”, “Invalid partition table” .
You can see this error in Windows XP, Vista, 7, 8, 8.1 or 10 and the problem is your hard drive boot sector, corrupted or has missing system files.
There are many things to try but we will show you the ones that helped us fix this problem .
1. You need an installation disk or USB installation device.
– Insert Windows installation disc and start the computer.
– Press a key when you are prompted to boot from DVD.
– Select language, time, s.o. and click Next.
– Click Repair your computer.
– Click the operating system that you want to repair, and then click Next.
– In the System Recovery Options dialog box, click Command Prompt.
* Type Bootrec.exe, and then press ENTER.
– After that if this does not work follow same steps and in the Command Prompt type
* c:
* cd boot
* attrib bcd -s -h -r
* ren c:\boot\bcd bcd.old
* bootrec /RebuildBcd
– In the System Recovery Options dialog box, you may also try Startup Repair .
2. Mark Windows System Partition as Active
– Insert Windows installation disc and start the computer.
– Press a key when you are prompted to boot from DVD.
– Select language, time, s.o. and click Next.
– Click Repair your computer.
– Click the operating system that you want to repair, and then click Next.
– In the System Recovery Options dialog box, click Command Prompt.
– in Command Prompt, type diskpart and press Enter.
– type list disk.
– select disk X, where X is the disk number
– type list volume
– find the partition where your Windows is installed and type select volume X, where X is number of your Windows partition
– type active and press Enter
– reboot computer
3. If this does not work and you really need the system to work, not to reinstall, you need to do some deeper things .
– You need connect the hard drive to another system with windows or boot with a cd/dvd/usb program like Windows Mini PE, Gandalf, etc .
– Then you need to right click on computer and then Computer Management .
– In CM, in Storage click on Disk Management
– Now on the problem Hard Drive search for the system partition (in Windows 7 a 100mb partition named System Reserved)
– The partition should be 100MB in Windows 7 and it need to be marked as System, Active, primary Partition and does not need to have a drive letter !!!
– If you don’t see this partition or it has different name or has a drive letter assigned you need to change the name and to remove the drive letter, then you can try one or all steps above.
*I managed to restore a system partition from another system that works by using Acronis (you may also use any imaging software)
– I’ve made an image from a system partition from another system that works
– On the problem hard drive I’ve created the System Reserved partition that was missing with 100MB
– Then I have restored the partition from the image partition made earlier from another system that works
– The I did the first step
Hope this helps .
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