Error Starting Program

!The MSNAPPAU.EXE file is linked to missing export.
ADVAP132.DLL Convert string Security Descriptor To Security Descriptor W.



I'll be sitting here looking at a site or checking my email in Hotmail or Googling something and that message suddenly pops up. Does anyone know what it means and how I can fix it? Is it serious?

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Minds are like parachutes. They only work when they are open.

~Thomas Dewar~