Windows 10 BSOD on startup

[dusty1000]

PC attempted startup many times, reporting different errors, but "driver overran stack buffer" repeated several times. No previous history of problems since installing 10 over 1 year ago. Eventually started after multiple attempts over several hours, but I had not changed any settings. All windows updates had been installed many days prior to this issue.

PC has now worked without problems for several hours, but I am reluctant to turn it off!

Any advice much appreciated.

 

[kemical]

I see you wrote the above a while ago, have you managed to get back into the bios?

If not try resetting your bios by removing the battery for a minute or so. 30 seconds is usually long enough but a minute is a definite.
Hopefully your bios will default to ide.

I think in your case you may have to reinstall windows after enabling ahci which I know your not happy about doing. Hopefully the bios reset will get you back to square one.
(just make sure the bios time is set correctly after the interruption.