Bug in Vista that renames user profile (user account profile) as a backup

Reference to thread here


This issue seems to be caused by a horrendous bug in Vista that renames your User Account Profile as a backup, and then creates a new user account with the same name but with nothing in it. Here is a possible fix for this issue, but if it doesn't work, you may have to re-image the computer.

1. Boot up in Safe Mode. To do this, hit the F8 key while the computer is booting, and then scroll down to the "Safe Mode" option and press enter. On my computer the user account icon appeared, but bigger than normal, and I clicked it and it loaded my desktop in safe mode. It came up with an error bubble saying that my user account hadn't loaded properly, but i just ignored
this.

2. Click the Start Button and in the white "Start Search" space at the
bottom type "regedit" (without the quotation marks). This will open the registry editor.

3. In the left-hand pane, navigate by clicking the little triangles next to the following folders:
HKEY_LOCAL_MACHINE
SOFTWARE
Microsoft
Windows NT
CurrentVersion
ProfileList

You should now have a list of folders all starting with S-1-5- and then a number.
(You might need to drag the divider between the 2 panes of the window across so you can read the whole folder name)
Look at the end of each name and you should see one with .bak at the end of it, and there will be another one above it with exactly the same name but without .bak at the end.
The one that's got .bak at the end is your old User Profile that Vista has now made into a backup, and the one without .bak after it is the new empty User Profile that Vista has created.
Just to check that this is the case, have a look in the right-hand pane for each of the 2 folders and look at what's written after "ProfileImagePath".
For the folder with .bak at the end it should say C:\Users\ and then your
usual User Account name, and for the one that doesn't have .bak at the end it
should say C:\Users\TEMP.

What you need to do now is to rename the folders in the left-hand pane so that the one with .bak at the end changes back to being the one containing your proper User Profile and the new one without .bak at the end becomes the
backup. Do do this follow the next step:

4. Right click on the folder with .bak at the end and then click "rename", and just change the ".bak" part to ".bk" - i.e. just remove the "a" from the middle - (this is just to allow you to change the other one to have .bak at
the end). Press enter or click on some blank part of the screen for the
change to take effect.
Then, right click the one that doesn't have .bak at the end and click
"rename". Remove the .bak from the end and press enter or click anywhere on some blank part of the screen to accept the change.
Then, right click on the one that now has .bk at the end, choose "rename" and add the "a" back into the middle, so it now has .bak at the end. Press
enter or click on blank park of screen to accept the change.
Close the regedit window.

5. Click the Start Button and then "Restart". It should work now. Fingers
crossed.

Location of windows automatic backup (system restore) of user profiles

First you need to boot into safe mode and then have to enable the built-in Administrator account. Incase if you are not able to boot into the built-in Administrator account in safe mode then enable the Built-in Administrator account. So after successfully enabling it, follow the below method:

1. First click on Start menu
2. In the search dialog box, type regedit and press enter
3. In regedit, go to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
4. In the left pane, look for the S-1-5 folder (SID key) with the long number that has .bak at the end of the numbers.

The user profile service failed the logon error in Windows 7

This is a quick fix, delete profile and recreate. Not recommended for sites that have large number of clients as helpdesk will need to personally "touch" each instance of profile corruption.


You can quite easily fix this problem yourself, follow these steps give below: 

• Delete the profile by using the Computer Properties dialog box. To do this, follow these steps:
  • Click Start, right-click Computer, and then click Properties.
  • Click Change settings.
  • In the System Properties dialog box, click the Advanced tab.
  • Under User Profiles, click Settings.
  • In the User Profiles dialog box, select the profile that you want to delete, click Delete, and then click OK.
• Click StartCollapse this imageExpand this image, type regedit in the Start search box, and then press ENTER.
• Locate and then expand the following registry subkey:
  • HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\ProfileList
• Right-click the SID that you want to remove, and then click Delete.
• Log on to the computer and create a new profile.

Location of user profile registry hive

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