I bought my daughter an acer aspire one with windows xp and the 120 gb hard drive for Christmas. She used it for a few hours and it shut itself down. When trying to restart the computer she gets the black screen saying that windows did not start successfully giving the options of starting in various Safe Modes, Last Known Good Configuration, or Start Windows Normally. No matter what option is chosen it it flashes to the black Acer screen then back to the black screen saying windows did not start succesfully. How do I get the computer to start up? Thank You!