windows wont do anything

callie

my parents have a dell laptop with windows xp service pack 2 in it .that quit
working.you can turn it on and sign into windows but that is it.. so we
decied to try to log in from safe mode and go to system restore no luck at
all.when open in safe mode and you try to open anything it will open and then
say something like dr watson debugging has caused an error and will now close
and it will keep saying this with different stuff has caused an error..so we
decided to try putting th os disk in and do a repair from there, well you
guessed no luck again it wont boot in at all..what else can i try..thanks in
advance for your help..
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callie