Just log into the admin pages of the router and set it up there. The disk is not needed to do a setup. if the router is still at its default settings then open an Internet Browser (IE, Firefox, whatever you use) type in 192.168.0.1 to the address line. The default login is admin with no password.
The manual can be downloaded here: ftp://ftp.dlink.com/Gateway/dir655/Manual/