Hi, I have an Acer Aspire 5515 Laptop with Windows Vista. I wanted to logon to my Userprofile and it said: "The User Profile Service service failed the logon. User profile cannot be loaded." I don't know what to do. Is there a way I can logon to my account. If not then what should I do? My laptop usually works without any problems. Thank you.

Because your user profile in Windows has been deleted or corrupted. You receive The User Profile Service failed the logon error message

try phoning acer if it is under warranty they should fix your problem

Please check following link from Mocrosoft knowledge base:

Error message: "The User Profile Service failed the logon. User profile cannot be loaded", when logging on to Windows 7 or Windows Vista

http://support.microsoft.com/kb/947215

PS: If it helps then please click on thumbs up.If you need more help then please let me know.

This isn't a password login problem - the User Profile Service service failed the logon because it's corrupted. Try to login in Safe Mode and access your account from there . If you can then retrieve all your files while you still can and prepare yourself for a reinstall.
If you can't then you will have to use a Linux Live-Cd like
http://www.pclinuxos.com/?page_id=10
to recover your files before performing a full reinstall.

I think you will logon in safe mode, copy your files for keep, and reinstall windows system. There is posibles, but will no work normal.

use F8 and go into sfae mode, this will load a default profile and will allow you to add a new user (to create a new profile).
Then you can logon in using the new profile.

this problem happens when you try to lo-gin in a temp profile because of group policies.
Follow this step after loging in a admin account.

To resolve this issue, follow these steps:

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

This will fix your problem.

sounds like you have a virus need to unistall your old virus protection and try downloading Http://www.filehippo.com AVG 9.00

Use this to reset your password: http://www.howtogeek.com/howto/windows-vista/change-your-forgotten-windows-password-with-the-linux-system-rescue-cd/

Sounds like a vista problem. Have youtried to boot into safe mode? You can do that by oressing f8 during boot up and selecting safe mode from the menu.

If you can I would try to back up your docs, etc and maybe create a new user account.

There is also a boot repair in vista that I think comes up with the safe mode menu, so you might try that.

Hope this helps