Window 8, The User Profile Service failed the sign-in. User profile cannot be loaded.

When I login my Dell computer with my only one standard account, I got prompt below:
 "The User Profile Service service failed the sign-in. User profile cannot be loaded."
I tried to access the system BIOS in order to perform a system restore. But unfortunately, it goes straight to the log on screen. I am a green hand on computer operations. Can anyone help me get rid of this problem?

Window 8, The User Profile Service service failed the sign-in

At the beginning, we should learn how the above situation may happen.

Situation 1, The user profile folder C:\Users\(user-name) was manually deleted without removing security identifier (SID) from the profile list in the registry.
If the SID is still present, Windows 7/8 will still load the profile by using the ProfileImagePath that points to a nonexistent path. So, the user profile folder should be deleted via Control Panel - User Accounts.

Situation 2, The C:\Users\(user-name) user profile folder itself was manually renamed, instead of using the right way method from the option below. Now, go on the former option from the blog, this is another option to solve Profile can’t be loaded problem.

Option One: Solve the User Account Profile

Procedure 1, At beginning, we’d better create a system restore point in case there is mistake in the registry. This will help us restore system to the created restore point and undo the mistake.

Procedure 2, Start Menu - > search box - > input regedit - > Enter - > prompt by UAC- > Yes.

Procedure 3, In regedit, go to the location path: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList

Procedure 4, There will be a “Registry Editor” window. A S-1-5 (SID) key with a long number displays on the left. Now see if the related Data value of ProfileImagePath is the account with profile problem.
If it is the error account, and there is only one SID key ended with .bak on the left, go on Procedure 6. If there are two SID keys with the same long number, one with .bak at the end, another without .bak, go on Procedure 5.

Procedure 5, If there are two SID keys,
First, rename the SID key without .bak by adding .bk in the end of the fold numbers.
Second, rename the SID key with .bak by removing .bak.
Third, rename the SID key with .bk to .bak.

Procedure 6, For the only one SID key with .bak ended, remove .bak from the long key name.

Procedure 7, For the SID key without .bak,
A. Right clicks on RefCount and then Modify.
If there is no RefCount, on any empty space of the right pane, right click and choose New. On the Edit DWOD (32 bit) Value dialogue, type RefCount and press Enter. For the Value data, input number 0, and the click OK. This value for this entry will reset and return back to the original value after you have restarted the computer and logged on to the account.
B. Right click on State and click on Modify.
Input 0 and click OK on the dialogue.

Procedure 8, The registry now has only one SID key without .bak. Close the rigedit and restart computer. If you can login computer correctly, then congratulate to you.

Well, if you still meet the problem after the above operations, I recommend you refer to pro tool – Windows Password Recovery Tool Ultimate to remove accounts and related password conveniently and login pc quickly! I am sure that it will save you much time and less you troubles!

Watch the video on Windows Password Recovery Tool to get more details!