I wasnt sure where to post this, anyway for the past 3 days someone keeps trying to attack my computer, my norton internet security keeps detecting them and as you can from the log entry below they keep trying to connect to the same port. does anyone know what this could be, spyware, botnet program? also, ive been trying to teach him a lesson by getting into his computer, and ive tried the usual, netbios, telnet, ftp, with no avail. can anybody suggest anything, or least direct me to a good tutorial.

heres the log entry:
24/01/2008 16:02:28,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.
24/01/2008 16:02:28,Intrusion: NMap Null Scan.,"Intrusion: NMap Null Scan. Intruder: 62.68.76.210(4865). Risk Level: Medium. Protocol: TCP. Attacked IP: SN049309320171(192.168.1.65). Attacked Port: 9472."
4/01/2008 15:26:28,Intrusion: NMap Null Scan.,"Intrusion: NMap Null Scan. Intruder: 62.68.76.210(3112). Risk Level: Medium. Protocol: TCP. Attacked IP: SN049309320171(192.168.1.65). Attacked Port: 9472."
24/01/2008 15:26:28,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.
24/01/2008 14:55:18,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.
24/01/2008 14:55:18,Intrusion: NMap Null Scan.,"Intrusion: NMap Null Scan. Intruder: 62.68.76.210(nsvt-stream(1570)). Risk Level: Medium. Protocol: TCP. Attacked IP: SN049309320171(192.168.1.65). Attacked Port: 9472."
24/01/2008 14:19:16,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.,Intrusion detected and blocked. All communication with 62.68.76.210 will be blocked for 30 minutes.