Without the CD, you should be able to log in directly to the router using IE and its access address (usually 192.168.0.1 or something but will say in the manual).
If you can't log in check IE options-connection is set to never dial and the LAN button is set to auto, completely disable any software firewalls to rule them out too.
If you still can't log in then go to a command prompt type
if still no joy then
and copy & paste in here what it says and also try pinging the router and localhost and see if you can.