Ummm your comp is like 1000x times better then mine, I think it could be your CD/DVD players laser is probably worn. Im not comp expert but it just what i think as ivehad same probs over the years,
I may be wrong but I thought Guild Wars Platinum edition was a DvD and not a CD.
It may sound stupid, but does your laptop have a DvD/CD drive and your computer doesn't?
Anyhoo. You can download the client here. http://www.guildwars.com/downloads/gwsetup.zip
Install that, start it up, then enter your access key you got with the game and it'll download the content while you play.