open ports

[dalila at despiertapr.com]

aside from ssh how did all these ports remain open on a desktop installation?  
also how can i close them?

PORT     STATE    SERVICE
13/tcp   filtered daytime
19/tcp   filtered chargen
22/tcp   open     ssh
111/tcp  filtered rpcbind
135/tcp  filtered msrpc
136/tcp  filtered profile
137/tcp  filtered netbios-ns
138/tcp  filtered netbios-dgm
139/tcp  filtered netbios-ssn
445/tcp  filtered microsoft-ds
512/tcp  filtered exec
513/tcp  filtered login
543/tcp  filtered klogin
544/tcp  filtered kshell
707/tcp  filtered unknown
1433/tcp filtered ms-sql-s
1720/tcp filtered H.323/Q.931