Please help. Logon.scr application error.

I've tried researching this all over the web but found no solution.

My system: XP Professional with service pack 1

After it idle, the error would pop up.
"Logon.scr - Application Error. The Application failed to initialize
properly (0xc0000142). Click on Ok to terminate the application."

I've already tried disabling the screen saver, replacing the logon.scr from
another PC did not work.

Does anyone know how i can fix this?

Thanks,
Kevin