how do i play downloaded pc games

ive recently started downloading games from torrent sites, they download np, then i use dvd decrypter to copy them, after they r copyed i put the game in, install it but when i try to play them it always says please insert disc 1!!!!!. this happened to me with doom 3, and i have noticed that some people do have problems with that game, so i downloaded worms (2 cds), it copys fine installs even better, but when i try to play it, the same happens again by telling me to insert cd 1, can some tell me what i am doing wrong please
Thanx

 

did doom 3 ask you for a serial?

 

yes,everything i done was correct i even had theicon on my desk top, but it just keeps asking for cd 1 when its already in the drive

 

get a no cd crack for it, than it'll work!

 

where do i get a cd crack and how do i apply it, total beginner to this

 

Alas, Doom 3 is SafeDisc v3 / Custom Code protected. Do a simple search in Google or Yahoo!, e.g. , 'doom 3 no-cd [or no cd]' maybe adding 'patch'.
I don't want to post a site name in public! I could doom the site!

 

anychance of pm it to me aldaco
cheers