Windows 10: Getting Error Message winload.exe missing with code Oxc000000f after clean install

Hi out there,

I'm kind of lost and not gettting it. My Windows died on me and I don't know why.
For starters, the story goes like this:

1. I used to have Win7 Pro on system SSD (drive C: obviously), one data HDD with some partitions
2. Time ist running out, so I decided Win10 has to come in as successor

What I did:

1. Bought a new SSD
2. Getting Win10 Pro Key
3. Creating a DVD for my stupid PC didn't want to boot from any USB device. Meh.
4. Decoupling the old SSD (remember: Win7) from PC
5. Coupling new SSD (SanDisk btw) into PC, replacing the old one
6. Starting installation routine

Well - it worked. Kind of. Got a booting Win10. So far, so good.

7. Decoupling the now booting Win10-SSD, replacing it with the old one.
8. Getting a blue screen with desribed error code above


I don't get it. The first SSD wasn't physically present in the system while installing Win10. So how could it be affected in it boot routine?
My goal was to get a dual boot system with both OS and first I just wanted to install on the space on the old drive. Better had done that, I guess.

PC ist BTO, 2,5 years, Intel i5 6600K (not OC), 16 GByte RAM, working fine. Bought with a full version of Win7 Pro (OEM-Key, of course)

How did I manage to demolish the Win7-Installation?
How can I get it repaired?

If somehow the MBR/GPT isn't on the SSD I installed on, why?
And how can I fix this without otherwise wrecking the new W10?
Oh, I'm so confused.

:)

 

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Where can I find a list of those errors. And I don't mean beep codes, but the "number" codes.

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Example picture of code is here.

 

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