Vista - The User Profile Service failed the logon.

I've been using Windows Vista Ultimate for almost three months now, and all
of a sudden tonight I couldn't log on to my laptop. Every time I tried I
received the message "The User Profile Service failed the logon. The User
Profile failed to load." I had successfully logged on to it only five hours
earlier, so I did not understand what could be going on.

Fortunately after Googling the error message (I originally used Microsoft
Live Searct, but did not get any results), I found someone who had a similar
error and had found that his profile had entered a backup state. I logged on
with my domain administrator account (it's good to be the king sometimes) and
examined the keys under HKLM\Software\Microsoft\Windows NT\Current
User\ProfileList\ and was able to find the key for my user id SID. Sure
enough, the key had a ".bak" appended to it and there was an identical one
that was set to a temp directory. I renamed the other key, removed the
".bak" from mine, and changed the State property under my key to 0. This
allowed me to log in.

Does anyone know what might have caused this issue? If this is a bug, its a
pretty severe one, as I can just imagine a help desk trying to resolve this
over the phone with their laptop users who all of a sudden can't log in.

Thanks.

Edit
Solution can be found here :- http://www.vistax64.com/tutorials/130095-user-profile-service-failed-logon-user-profile-cannot-loaded.html

I'm new to Vista so I asked my wizz friend and then I managed to solve the problem:
1. I closed down.
2. Turned computer on and immediately pressed F8 repeatedly until I got "Advanced Boot Options".
3. used the down arrow to select "Safe Mode" and pressed enter.
4. computer then opened eventually in the funny look of safe mode, with a "Help" window.
5. In the help window there is an underlined "What is System Restore?" Clicking on that gave me the answer and "Click to open System Restore"
6. I clicked on that and a new window came up recommending restoring to a previous state before windows update which I had done before the fault occurred.
7. I clicked OK and after a bit of whirring all came up OK. Can you imagine how pleased I felt?
8. Incidentally I had also changed the display font size to the larger size just before the fault occurred so while in Safe Mode I managed to remember how I had done that and changed it back again as that may have caused the fault.

The User Profile Service service failed the logon,

After 2hours i solved the problem by logging on as "administor"
and "restored System" by going to CONTROL PANEL / SystemMaintance\System and in "Tasks" selected 'System Protection' then clicked on the 'system restore'. The computer just down its thing -restarted its self back to 'user login' sccreen and I was then able to login again.
Cheers

I had this same problem last evening; I did a System Restore, but doing this has royally messed up my McAfee. If I uninstall McAfee completely and try to reinstall it, the computer won't read the cd correctly; instead of "Next" and "Cancel," the two buttons on the first screen both read "Label" and clicking on them brings up another blank screen. However, if I try to run McAfee directly after the system restore, it takes five minutes to read the computer and then either comes up with a blank screen (with the McAfee header) or says that I must reinstall. Any ideas??

examined the keys under HKLM\Software\Microsoft\Windows NT\Current
User\ProfileList\ and was able to find the key for my user id SID. Sure
enough, the key had a ".bak" appended to it and there was an identical one
that was set to a temp directory. I renamed the other key, removed the
".bak" from mine, and changed the State property under my key to 0. This
allowed me to log in.

how do u find where those are at???

Hello,

turn on your computer then hold press F8 You will see on the screen " Repair Your Computer" then Enter. Don't choose Administrator if you don't know the password use your own administrator user name and your password,. then press Enter.

On the screen

You'll see on the first Category "Startup Repair" and the second one "System Restore"

click on Startup Repair then when Your done doing it restart your computer. if doesn't work try the second one System Restore then click on it. again when your done Restart your computer.

Doesn't work?
I will help YOU!

Thanks we love you.


--
bean
Posted via http://www.vistaheads.com

Hi,
Itried editting the registry key however it's my main administrator account that I am blocked out of so the only other account I can get into on my PC is an account without full permissions.

I can see the problematic key with the .bak but I can't rename of delete it.

Any ideas what I can do?

Thanks
Dave

Hi Dave,

Welcome to Vista x64 Forums.

See if this can help you. You will probably need to boot into Safe Mode.

The User Profile Service failed the logon. User profile cannot be loaded.

Shawn

Thanks Shawn.
I've now sorted my log on problem by doing a system restore.