Windows cannot load the user's profile but has logged you on with the default profile - INCORRECT FUNCTION

[SOLVED]
Suggestions:

1) Boot into safe mode and log in as Administrator.
2) Copy ntuser.dat from %windir%\repair to "C:\Documents and Settings\YourLogonUser".

[NOTE]
before you copy ntuser.dat from %windir%\repair ... PLS BACK UP previous ntuser.dat on "C:\Documents and Settings\YourLogonUser" to ntuser.dat.bak on the same directory that gave you the problem in case restore process fails on the upcoming process.

[NOTE]
- how to go to %windir%\repair : Click on "Start" and then "Run" and finally paste
%windir%\repair on the Run inputs and it bring you to the directory.


3) After you had copied the ntuser.dat from %windir%\repair to "C:\Documents and Settings\YourLogonUser, Do a system restore to a point in time prior to when the corruption message began to appear.

Or...

Relocate NTUserdat

1)Look in HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\NT\CurrentVersion\ProfileList and find the profile you want to change
and
2) Change ProfileImagePath to the ntuser.dat folder that you want to
use.
3) You must manually copy or move the ntuser.dat file there.

I would recommend the first step rather than the second IF ONLY you have a good habit using "System Restore" to create restore point from time to time.
well, hopefully this helps to restore your previous user profile and good luck.