Ok to troubleshoot you need to bone out the actuall problmem

1. can your computer resolve the daz3d.com into and IP adress ?
        if Yes  then it's not a DNS problem, if no you have a DNS issue and talk to your ISP
2. If it resolves, try doing a tracert xxx.xxx.xxx (ip adress) see if you can reach the host
3. if the trace works, try telnet xxx.xxx.xxx :80 or 8080, if you get a promt it connects

Ones u know u can reach the host and connect to the web server and it still won't show, it's most likely a local computer problem, firewall, somthing is blocking it simply