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So, I have a computer with windows 10 that haves 3 hard drives. Today I tried to install windows 7 onto one of them. Installation goes with no problems. After it's done and computer restarts it goes to windows boot manager (exactly what I want). If I select windows 10, it boots properly, but if I try to boot into just installed windows 7, I get an error telling me that digital signature for windows\system32\winload.efi could not be verified.

 

If anyone knows how to solve this I'd be really thankful, I need to use one software that doesn't work on windows 10 and is too heavy to be run in virtual machine.

 

ps. sorry for my terrible english, i'm finnish so...

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