Open Ports & How do I close them?

Hi Guys,
I have recently become interested in finding out how to further protect my PC from incoming and outgoing attacks via vulnerable ports. I was hoping that some one could let me know how I can close certain ports off so I can make my PC less vunerable. I have used Shields Up to scan the first 1056 ports and the results are; Ports 0,21,23,135,139,254,255,445,593 are stealthed and Port 80 is open.

I am using Norton Internet Security 2005 (firewall set at high) along with Norton Anti Virus, I connect through a D-Link Wireless Broadband router with Firewall capabilities and my ISP blocks certain ports at their servers as well.

Can someone help me to better decipher exactly what the scan results are telling me? Thank you all for your help in advance. More results are listed below.


Service
Status Security Implications

0
<nil>
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

21
FTP
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

22
SSH
Closed Your computer has responded that this port exists but is currently closed to connections.

23
Telnet
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

25
SMTP
Closed Your computer has responded that this port exists but is currently closed to connections.

79
Finger
Closed Your computer has responded that this port exists but is currently closed to connections.

80
HTTP
OPEN! The web is so insecure these days that new security "exploits" are being discovered almost daily. There are many known problems with Microsoft's Personal Web Server (PWS) and its Frontpage Extensions that many people run on their personal machines. So having port 80 "open" as it is here causes intruders to wonder how much information you might be willing to give away.

110
POP3
Closed Your computer has responded that this port exists but is currently closed to connections.

113
IDENT
Closed Your computer has responded that this port exists but is currently closed to connections.

119
NNTP
Closed Your computer has responded that this port exists but is currently closed to connections.

135
RPC
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

139
Net
BIOS
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

143
IMAP
Closed Your computer has responded that this port exists but is currently closed to connections.

389
LDAP
Closed Your computer has responded that this port exists but is currently closed to connections.

443
HTTPS
Closed Your computer has responded that this port exists but is currently closed to connections.

445
MSFT
DS
Stealth There is NO EVIDENCE WHATSOEVER that a port (or even any computer) exists at this IP address!

1002
ms-ils
Closed Your computer has responded that this port exists but is currently closed to connections.

1024
DCOM
Closed Your computer has responded that this port exists but is currently closed to connections.

1025
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1026
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1027
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1028
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1029
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1030
Host
Closed Your computer has responded that this port exists but is currently closed to connections.

1720
H.323
Closed Your computer has responded that this port exists but is currently closed to connections.

5000
UPnP
Closed Your computer has responded that this port exists but is currently closed to connections.