Guild Wars 2

A friend of mine recently purchased Guild Wars 2 and has been trying to install it on her computer. Unfortunately, the disk has thus far failed to autoplay properly. She has tried several other disks of hers, and they seem to run well enough. Are there any possible reasons and remedies to this issue. If so how should she go about addressing it? If not, is there a way she can use the serial code she got to download the game online?

Yeah, even if she did get it to install from the disk, there are huge patches she would have to download.

Assuming she has already created her account:
https://account.guildwars2.com/login?redirect_uri=/account
There should be a download client button on the left side of the page. Then, hit the download X client where X is Windows if she has Windows XP/Vista/7/8 or Mac if she runs a Mac.