The most common reason that cause the “We can’t sign into your account” problem , is the installation of a critical Windows 10 Update.

To fix a corrupted profile in Windows 10, 8 & 8.1

Open Command Prompt as Administrator. To do that:

• At the search box type: command prompt or cmd
• Right-click at Command Prompt result and select Run As Administrator.

At command prompt type the following command to enable the hidden “Administrator” account and press Enter.

• net user administrator /active:yes

Restart your computer.

Sign-Out from the current user (temporary profile) and login as Administrator.

Open Registry Editor: To do that:

• Press simultaneously the Windows  + R keys to open the run command box.
• Type regedit & Press Enter.

Navigate to the following key at the left pane:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList

Double click at ProfileList registry key, to view its content.

Click at each “S-1-5-21-xxx…” registry key and see which of them contains the value “C:\Users\%AccountName%“at ProfileImagePath  *

* e.g. If your Account name is “John” then see which S-1-5-21-xxx…” registry key, contains the “C:\Users\John” value.

When you find that “S-1-5-21-xxx…” key then select it (at the left pane) and delete it.  *

* Attention: Delete the “S-1-5-21-xxx…” which contains only your account name at “ProfileImagePath”.

Now find which “S-1-5-21-xxx…” subkey contains the following value at “ProfileImagePath”: “C:\Users\%AccountName.ComputerName%” *

* e.g. If your Account name is “John” and the Computer Name is “HP” then see which S-1-5-21-xxx…” registry key, contains the “C:\Users\John.HP” value.

When you find that value, double click at “ProfileImagePath” and remove the dot (.) and the computer name from the value data box. Then click OK. *

* e.g. Rename the value from “C:\Users\John.HP” to “C:\Users\John” and click OK.

Close Registry Editor.

Open Windows Explorer and from the View tab click Options.

Enable the “Show Hidden Files” and unhide the “Protected operating system files“

Then from the “C:\Users\%AccountName.ComputerName%“folder (e.g. from “C:\Users\John.HP”) copy and paste the following  four (4) files to the “C:\Users\%AccountName%” folder (e.g. to “C:\Users\John”): *

NTUSER.DAT
NTUSER.DAT.LOG1 & NTUSER.DAT.LOG2
NTUSER.INI

* Note: Replace the files in the destination.

Restart your computer.

Sign-Out from the Administrator account and login with your Account (e.g. John). Your account profile should be back!