How do you defeat Aragog in Harry Potter and the Chamber of Secrets for Xbox?

Answer 1

There are two ways on right and left of aragog. get on the side on which there are eggs and reducto them. then aragog will come up there. when you see something hanging over aragog cast a spell byholding circle then follow the on sccreen commands{the keys to cast that spell the the thing will drop on aragog and he will lose a life or two. do this until he dies and you win.

Answer 2

There is a glitch in the game here - you need to use descendo to drop the blocks onto Aragog 4 times when he is in position after destroying the eggs. However, there seems to be a problem with being able to perform the charm on the 4th block as sometimes there is no option to do it. I had to restart the entire level three times to do it.