I have a Toshiba A55-S1064 laptop. It worked fine a few days ago, and the last item I went to use it it would not boot up. It goes through the Toshiba screen, the Windows XP screen, then another screen pops up that tells me they apologize for any incovenience for Windows not booting up, gives me different choices to try to boot up. Safe mode, Safe mode with networking, Safe mode with command prompt, last known good configuration. If I pick one of those, the computer cuts off, then a few seconds later starts back up and goes through the same routine. If I press F8 while turning it on, I can pick one of the choices, and another screen comes up, and it looks like it is scrolling through files. It does that a few seconds, then it cuts off and goes through the same process again. What is wrong, and how do I fix it??