--turn off your computer for a moment and see if the problem still exist
--try to use your windows install dvd disk to boot your computer first (to see
if the computer work or not), make sure you apply your dvd drive as your first
chose of boot up device
--go to
www.google.com and search under "windows 無法啟動"
(
http://www.google.com.hk/search?hl=zh-TW&q=windows++%E7%84%A1%E6%B3%95%E5%95%9F%E5%8B%95&meta=&aq=f&aqi=g4&aql=&oq=&gs_rfai=)
--go to
www.youtube.com and search under "windows boot up problem"
(
http://www.youtube.com/results?search_query=windows+boot+up+problem&aq=f)
and find out which method would suitable for your case
--you might consider to reinstall your Window if and only if everything don't work
--if you decide to take your computer to a repairman and you have somethings
secrets on your hard drive, then I suggest you buy a new hard drive instead
of repair
--but I strongly suggest you try to do the repair by yourself even you might
not success at the beginning, get the experiment so you know what to do
next time