Get Stucked By User Profile Service In Vista

Scenario
After keying-in password and hitting enter on the Windows Vista logon screen, error message "The User Profile Service service failed the logon. User profile cannot be loaded." pops up, followed by automatic logging off.

Background
One of my housemates took out the fully-charged battery from his newly bought laptop, and using the AC-adapter as the sole power input. He switched off the AC power supply after turning the laptop into Sleep mode.

Problem-solving
Dell Solution Network: Knowledge Base Article
The User Profile Service Failed the Logon Error Occurs When Logging Into Vista
In this scenario, "Delete the Corrupted SID Within the Registry" on the official solution does not help at all, as logging in is prohibited by the automatic logging off after the error message.
So I restarted the system, pressed F8 during startup until I got into the Startup menu. I chose the 1st option, Repair Computer, followed by Restore the System. It just simply works!

Discussion
The major cause could be due to user SID or user profile not being properly saved into hard disk.
"Sleep" is totally different from "Hibernate".
During Sleep mode, data is temporary stored into RAM that is maintained by power supply; while in Hibernate mode, data is physically written into hard disk.

Conclusion
Thus it is advisable not to bother the battery while using laptop, unless you really want to elongate the life span of the laptop battery, and that you have UPS with you.