Can't boot into Windows after trying to revert from W10 back to 7.

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Freenamepls

Ooh where to start? I tried reverting back to Windows 7 from (the godawful) Windows 10 that I'd 'upgraded' to previously. I was within the 10 day limit. I set it doing its thing, and next time I looked at it it had crashed after failing to fix something during startup repair (had to hold power to get it off this one time, but it had already failed so I don't think that's the issue itself).


Now every time I try to boot it up it goes into startup repair, which fails. The reason for failure seems to have changed over time. One time it said 2 files (I believe they were Avira anti-virus files) were corrupt. I've not checked the issue every time since I assumed it'd be the same, so there may have been others too. Now it's saying that it can't determine what the issue is. When I've tried booting into Safe Mode it says there's no issues (although it still doesn't actually boot up).


Incidentally it seems to be Windows 7 now, not 10. I don't recall where I saw it but it said somewhere that the last successful boot up was on a date before I'd downgraded to 10. Also, pressing F8 and using last good config didn't work either.


I tried putting in the W7 installation disc to use the repair function, but it said that my version of windows isn't supported or something. Anyway after some messing about with SATA ports and boot orders and unplugging D drive, I managed to get into the repair menu, only for that to fail too! While I had the disc in I also tried replacing some registry entries from the command prompt that I saw in a post somewhere else (system, software, security, sam, default). Still no luck.


CHKDSK doesn't come up with anything (well at least I don't think it does, it says 0 bad entries or something, not really sure what it all means). Although it did say something about failing to log a report.


Quite frankly I have no idea what's left to try. Thought I'd ask here before trying the final solution of reinstalling Windows from the disc (I'd like to avoid that if possible). If I do have to reinstall from scratch, does anyone know if all my files/things installed on the D drive will still work (Windows would be on C:)?


So last ditch effort, anyone got a clue as to what could be up with my PC?

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