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Windows 7: Dual-Boot System upgraded to Win10, now Win7 gives LogonUI.exe error

25 Nov 2015   #1

Windows 7 Professional 64 bit
Dual-Boot System upgraded to Win10, now Win7 gives LogonUI.exe error

I have a dual boot system in the following configuration:

HDD-0 = Win7 OS, HDD-1 = Win7 OS, WinXP OS. I have successfully booted into each of these operating systems - and the Win7 OS on HDD-1 is an exact clone of the primary OS on HDD-0.

I just upgraded the Win7 OS on HDD-0 to Windows 10 using the "Get Windows 10" process. I now get the new blue Boot Manger screen with all three OS's listed and I can successfully boot into Windows 10 and Windows XP. But I cannot boot into the Win7 OS on HDD-1 (which I could before the Windows 10 upgrade). How the upgrade even knew about the other copy of Windows 7, since it was not active and lives on another HDD is beyond me.

One strange thing - if I do a cold startup (power on) I get the new Boot Manger screen. But if I do a Restart from Windows 10, I get the old, black & white boot manger screen - and it does list all three OS's correctly, too.

The error message I get when trying to open (boot) the Windows 7 OS is: "LogonUI.exc - Entry point not found. RtlReleasePath could not be located in the ntdll.dll" And, like others, I now get the black screen with "Windows 7, Build 7601 This copy of Windows is not genuine (but it was yesterday before the Windows 10 upgrade on the other HDD).

And like others, I can start the Crtl+Alt+Del to get the screen with users, Task Manger, etc. And, I can run all my applications by manually starting them in a New Task and browsing to the exe file - like Firefox.exe or Word.exe So, it looks like Windows 7 started and may be running. I just can't get into it.

I understand this may have something to do with the faster boot that was introduced in Windows 8 since the problem started around then.

I think both issues, the LogOn and the "Not Genuine" are both related to the Entry Point no located in the ntdll.dll.

At this point I really don't want to reload Windows 7 since it appears to be running and all the apps can be run manually.

All this happened after the upgrade of the other Win7 on HDD-0.

I'm going to post this in the Tenforums, too, since it appears to be related to that "Get Windows 10 Upgrade.


My System SpecsSystem Spec
25 Nov 2015   #2

Win-7-Pro64bit 7-H-Prem-64bit

If it's a clone of the original install then you already upgraded the 7 install and 10/ M$ knows it.

The free upgrade is about eating/ removing win-7 and other qualifying licenses not keeping both at the same time,

There was a fishing story that M$ didn't care but the clone would have to be disconnected and never connected with the 10 install
But I wouldn't give that fishing story much credit = you upgrade and that is that.

The only way back is 10's system restore.
And probably a clean install of the qualifying os.
My System SpecsSystem Spec
26 Nov 2015   #3

Windows 7 Professional 64 bit

Hi - Thanks for the reply. But, the clone was taken before the other copy was upgraded.

And, I can boot, sort of, into that Win7 on HDD-1, the Starting Windows 7 screen opens, then the LogonUI error. Clicking past that, I can Crtl+Alt+Del and open the screen with the switch users, change password, run Task Manager. And, if I run Task Manager, I can actually run all my old Windows 7 programs.

All that tells me that copy of Windows 7 is still there and running ( I even get the correct Shutting Down screen for Windows 7). Its just that I can't get pasted the LogonUI.exe error. I did fix the "not genuine" issue buy running from Cmd the slmgr -rearm. So now after I get past the LogonUI error, I just get a black screen, no real desktop.
My System SpecsSystem Spec

26 Nov 2015   #4

Windows 7 Professional 64 bit

See this thread on the Tenforums ------ solved by loaded an image (out of date) but booted just fine. I still don't think the Windows 10 upgrade on HDD0 should have affected the Windows 7 on HDD1 since it was not being upgraded, but sfc /scannow found damaged files and could not repair them. Also, this partition ran just fine prior to the upgrade of the "other" Windows 7 partition.


Solved Dual-Boot System upgraded to Windows 10, now Win7 gives LogON error - Page 2 - Windows 10 Forums
My System SpecsSystem Spec

 Dual-Boot System upgraded to Win10, now Win7 gives LogonUI.exe error

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