Disk will not run

[Pheonix]

My son just got this game from Amazon. It will load on my computer but not my sons. His computer has XP. I tried going to the Steam site and entering the serial keys but a message came up saying invalid key.One of the keys is in xxxxxx-xxxxxx-xxxxxxx-xxxxxxx the other is in xx-xxxxxx-xxxxxx-xxxxxx-xxxxxx.

[Pheonix]

It would be nice if customer service would respond so we can fix this problem.