I can't open my file for Assassin's Creed 3?!

jdsophie

Honorable
May 14, 2013
1
0
10,510
So I've just recently bought the game Assassin's Creed 3 from "Amazon" for my PC, from the seller Ubisoft. When I first inserted the first disc it installed until a message popped up asking "to insert the second disc that contains the file data3.cab". So I did but I can't open the file they've asked me to. A message poppes up saying "Can't open the cabinet file". Is it the game or my computer? Any tips?