start up

[brian]

hi please help!!!!
anybody tell why after restarting my pc or turning it on
i get message saying an i/o operation initiated
unrecoverably.the registry could not read in,or write out
or flush one of the files that contain the systerm image
of the registry.every time this message appears i have to
click ok and the pc will restart up again this prosedure
will happen several times until the pc does load up.