Windows XP Login Password Field

Hello all

I have only one user account on my machine, Guest account is disable.
When ever I start my PC, log on password field ( Box ) always show in expended mood ( Default ) As shown in screen shot

http://i44.tinypic.com/2u7sgac.jpg


Few days before when i start my PC I noticed that on login screen, password field ( box ) is on collapsed mood, and now I have to press "Tab" twice or click with mouse button on my user name, for type my password and log on my account.

http://i39.tinypic.com/iwn5dv.jpg

its happend with me few times before and i don't find any solution for it, the only solution I know is reinstall my System (XP Windows)

Is there any way that I can revert this change ? I just want my 1st log in option ( default ) back. I know its not a big problem, I just wana resolve this problem as an educational / experimental purpose.

System: Windows XP Professional with SP2
Kindly help me


Regards