Hi,
My daughter's computer won't start up.
The text states:
"winlogon.exe unable to locate component.This application failed to start because OLEAUT32.dll was not found.Re-installing the application may fix this problem."

Has anybody any suggestion as to how I can do this?

Thanks for your help!

You might try a System Restore to a point prior to your problem:

start > All Programs > Accessories > System Tools > System Restore