Are you behind a router? The fact that you are getting host unreachable at the first hop tells me that you aren't able to lookup the ip properly. It could be your router settings or it could be a firewall or dns issue. When you do the ping, what's the address of nexon.net in parentheses? Mine is 63.251.217.189, so yours should be fairly similar. Probably either the same or off by the last few digits.
Check your hosts file for any entries that mention nexon. It's in C:\Windows\system32\drivers\etc
Open it with notepad and copy any lines that mention nexon (if they exist) here. Don't change that file until someone ok's it though because you can cause problems. Let me know these details and we'll go from there.
Check your hosts file for any entries that mention nexon. It's in C:\Windows\system32\drivers\etc
Open it with notepad and copy any lines that mention nexon (if they exist) here. Don't change that file until someone ok's it though because you can cause problems. Let me know these details and we'll go from there.