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Bootmng error - can't start computer

Microsoft Windows 7 (64-bit)
Please help! I was recently trying to factory reset my computer (without cd) and neither of the f11 key or f8 did anything. So I looked around for some tutorials and I found someone telling me to Mark the partition as active. I did and it told me only to do it on drives with an OS installed. So I did it on my c drive, which has win 7 on it. I'm assuming this is what caused the issue. Now whenever I start my computer, it just says bootmng missing. I can't access anything. I have an HP Compaq desktop with Win7.
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Bootmng error - can't start computer

I actually fixed it on my own, so for those who have this error, here is my solution: **bleep** HP!! Get the Microsoft USB/DVD tool, download a Windows is torrent, and create an install USB or DVD.
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Bootmng error - can't start computer

You marked the wrong partition as "active".

Windows 7/8/10 have a "Boot Manager" partition, typically only 100 MB (not GB) in size, that is the "active" partition.

The motherboard starts to boot from the "active" partition, and then transfers control to your 'C:' partition to complete the process.

 

So:

1. Remove your disk-drive from your desktop computer.

2. Connect it as a secondary disk-drive in some other desktop computer.

3. Boot that computer.

4. Start "Disk Management" on that computer.

5. Select the secondary disk-drive.

6. Mark that "Boot Manager" partition, on that disk-drive, not on the "primary" disk-drive, as the "active" partition.

7. Shutdown.

8. Move the disk-drive back to your computer.

9. Reboot.

 

Done.

 

P.W. What model-number of computer?

You may be able to purchase a "System Recovery Set", to reinstall the "factory-loaded" operating system.

 

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