How do i fix boot error without losing data

[Lionel L M]

So i have an acer veriton X270 and a Lenovo thinkpad pc. Since the Acer is abit older it wouldnt want to boot install windows 10 from usb. i removed the lenovos ssd and put in the acers HDD to install windows into the acers HDD via lenovo.it worked. when i put back the ssd into the Lenovo, it wont boot. It goes into Automatic repair mode and diagnosis but fails to fix the problem. It says wimdows failed to start properly. and startup repair gives me Log file: D:\windows\system32\ logfiles\srt\srttrail.txt.

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