CTF all the day

Hi to everyone !!
Please help me where to start CTF windows xp pro 1 ??
thank you

Hello, I don’t have any port open. Is it normal ?

$ sudo nmap -sS -p1-65535 ctf02.root-me.org

Starting Nmap 6.47 ( http://nmap.org ) at 2015-12-20 11:41 CET

Nmap scan report for ctf02.root-me.org (212.129.28.21)
Host is up (0.14s latency).
All 65535 scanned ports on ctf02.root-me.org (212.129.28.21) are filtered

Nmap done : 1 IP address (1 host up) scanned in 9462.88 seconds
$ ping ctf02.root-me.org
PING ctf02.root-me.org (212.129.28.21) 56(84) bytes of data.
64 bytes from ctf02.root-me.org (212.129.28.21) : icmp_seq=1 ttl=121 time=42.3 ms
64 bytes from ctf02.root-me.org (212.129.28.21) : icmp_seq=2 ttl=121 time=41.2 ms

With another public IP, my nmap scan is working 🙂