So i click install and everything is going well , but then halfway through a window pop up and it tells me "Please insert disc 2 that contains DATA3.CAB ,( I don't have that file in my computer) and i put in disk 2 , then another window comes up and tells me to choose a file , so i pick gta folder ,and it says error and then the download window closes. i have no idea what to do im not good at files computers or anything .I bought the game 8 months ago and cant play it

i have windows 7 home premium 64 bit