No, he did not. You're probably thinking of his nemesis from the X-Men films, Ian McKellen, who played Gandalf in LOTR.
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Jason Isaacs was not in the Lord of the Rings movies. You may be thinking of Hugo Weaving, who played Elrond.
No. He does play Argus Filch in the Harry Potter films though.
No. Elijah Wood played Frodo in The Lord of the Rings and Augustus Prew played Robin De Noir in The Secret of Moonacre.
He didn't play in any of the Harry Potter films. He played in Lord of the Rings. Actually, his name is Sir Ian McKellen.