How to solve a error ' The User Profile Service failed the logon. User profile cannot be loaded.'

This type of error can be frustrating as there is a risk of damage of all data and private files of user. If you search for solution of this error on google, you will find plenty solutions but they are very difficult to user specially f you are not a professional computer user. So here is a quick solution to a ploblem. Just follow us steps:

Step 1: You should have at least two user accounts. At least guest account. Open that unaffected account.
Step 2: Search for system restore. If you want to do it manually. Go to control panel and click Backup and Restore.
Step 3: Restore your system to any previous restore point.

Click if you don't know how to restore your Windows 7.
Click if you don't know how to restore your Windows XP.

Note: If you are unable to run system restore, try running in safe mode.