Windows 10 Bootcamp dual boot problem after El Capitan upgrade

What I did:

DISKPART list volumes

VOLUME 0 C BOOTCAMP NTFS Partition 121 GB Healthy

VOLUME 1 D WININNSTALL FAT32 Removable 7663MB Healthy

select volume 0;

attributes volume clear readonly;

OUTPUT: Volume attributes cleared successfully.

then I did the copies.

To c:\Windows\system32 it was OK.

To c:\Windows\System32\boot it was NOT OK (The process cannot access the file because it is being used by another process).

Note that previously there was no copy error.

update: I navigated to the boot folder then deleted winload.exe (it worked....strange!)

then I copied the specified file into there.

then I tried to boot into windows but it failed (System32\winload.exe is the error file)

result of the MD5 checking:

./Windows/System32/Boot/winload.exe

MD5(./Windows/System32/Boot/winload.exe)= 7eaf2f0acfee4c463f69bfb7f96c0446

./Windows/System32/winload.exe

MD5(./Windows/System32/winload.exe)= 7eaf2f0acfee4c463f69bfb7f96c0446

./Windows/WinSxS/amd64_microsoft-windows-b..ment-windows-minwin_31bf3856ad364e35 _10.0.10240.16384_none_57ec180996abd934/winload.exe

MD5(./Windows/WinSxS/amd64_microsoft-windows-b..ment-windows-minwin_31bf3856ad36 4e35_10.0.10240.16384_none_57ec180996abd934/winload.exe)= 0ba0c50d2e6ec5658713b453389659b9

./Windows/WinSxS/amd64_microsoft-windows-b..ment-windows-minwin_31bf3856ad364e35 _10.0.10240.16405_none_57edd07996aa22aa/winload.exe

MD5(./Windows/WinSxS/amd64_microsoft-windows-b..ment-windows-minwin_31bf3856ad36 4e35_10.0.10240.16405_none_57edd07996aa22aa/winload.exe)= 6e8b85a2274d2a7898ad88c844e87ef4

./Windows/WinSxS/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad364e35 _10.0.10240.16384_none_63272be107542aec/winload.exe

MD5(./Windows/WinSxS/amd64_microsoft-windows-b..vironment-os-loader_31bf3856ad36 4e35_10.0.10240.16384_none_63272be107542aec/winload.exe)= 0ba0c50d2e6ec5658713b453389659b9

On the installation pendrive:

MD5(./backup/winload.exe)= 7eaf2f0acfee4c463f69bfb7f96c0446

So it seems that it stucked with the backed up version.

Finally i found the solution!

After a while I decided to reinstall my Windows so I started the recovery disk and choosed reinstall windows with keeping my files. It said that my windows 10 partition is locked. With diskpart I checked that readonly attribute is false, so I googled for this scenario and I found this link :http://www.boyans.net/RepairWindows/The_drive_where_Windows_is_installed_is_lock ed.html

The key was: bcdboot c:\Windows /s c:

The output was "Files successfully copied" or something like that.

Then I tried to boot into windows and it worked!

Loner T, I'd like to thank you for your time and patience, I learnt a lot from your responses. I hope that the link I found may be useful for you also.

Thanks!