How to make a not in pace repair installation?

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If you have Windows 10 DVD or USB (use Windows 10 ISO to create them in Windows 8.1) boot with it and select Repair. It may not do anything and suggest you more advanced options. From these options select System Restore and then return to a restore point before you installed the software. If System Restore cannot complete successfully on the last point, try the previous one, until you succeed.

spapakons said:

If you have Windows 10 DVD or USB (use Windows 10 ISO to create them in Windows 8.1) boot with it and select Repair. It may not do anything and suggest you more advanced options. From these options select System Restore and then return to a restore point before you installed the software. If System Restore cannot complete successfully on the last point, try the previous one, until you succeed.

Thank you for your interest; alas that is a path I've already walked.

Sorry all for the title issue of this thread.

I said to try boot from the DVD and repair from there, since booting from the disk may fail.

spapakons said:

I said to try boot from the DVD and repair from there, since booting from the disk may fail.

May you address me an article to explain in details your point pls?

If the hard disk has problems, trying to repair Windows from there may fail due to access issues. Booting from the Windows 10 DVD or USB should be independent of these problems and allow you to troubleshoot your computer.

Sorry, you need to reference e detailed option.

OK, boot from Windows 10 DVD (or USB) Wait until you see the Setup now screen. At bottom left there should be a link "Repair". Click on that and it will try to repair startup on the Windows 10 installation detected on hard disk. This may slove the problem and prompt you to restart and check. But usually does nothing and suggest you to try more advanced troubleshooting options. If you click to see these options, there should be System Restore. Click on that to see the available restore points. Try the most recent one (by date) first. If it succeeds you should be on Windows 10 desktop and a message should tell you it was successful. Otherwise, try the fist older, then a bit older, until one of them succeeds. I usually avoid the most recent that has little probability to fix the problem and try directly the previous.