shutting down

my comp started shutting down yesterday and now i cant
even hardly get it up and going. it has taken me an hour
to get here to send this. my problem is the same as
erin's. please help me fix this problem. i cant work
without my comp. its a vital part of my job. all help is
apperciated. i heard something about this on the news
today. well i have the message again. better go. bye and
thanks for the help...theresa