i own oblivion for the computer,but my comp cant run it,im getting a new one in about a year,but i also have shivering iles,both of the discs are scratched up,and they both are too scratched to work,since i cant reinstall,but i do own both the game and expansion,would it be illegal to download a torrent of both of them?because when i get my new computer im gonna really want to play it.

Yes, it would be illegal. Purchasing a game does not give you license to just download copies of it illegally because you own one legal copy.