SQL Developer shows I/O Exception

Hi
I am new to oracle
Two weeks ago I have installed Oracle 10g and SQL Developer 1.5.4 in my laptop.
Initially everything was working fine.
For the last one week, SQL developer has been showing an error message "Network Adaptor could not establish the connection". But SQL Plus is working fine
I am not able to understand the problem...I am not able to use SQL Developer
pls help me

Thanks for ur patience
I have just executed the commands that u have asked me to do..
but I couldnt figure out how to fix this issue.... please help me
Here are the results:
C:\Documents and Settings\Srinivasam>ping santosh
Ping request could not find host santosh. Please check the name and try again.
C:\Documents and Settings\Srinivasam>ping localhost
Pinging Srinivasam [127.0.0.1] with 32 bytes of data:
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Reply from 127.0.0.1: bytes=32 time<1ms TTL=128
Ping statistics for 127.0.0.1:
Packets: Sent = 4, Received = 4, Lost = 0 (0% loss),
Approximate round trip times in milli-seconds:
Minimum = 0ms, Maximum = 0ms, Average = 0ms
C:\Documents and Settings\Srinivasam>hostname
Srinivasam
C:\Documents and Settings\Srinivasam>nslookup santosh
Server: dslrouter.westell.com
Address: 192.168.1.1
**** dslrouter.westell.com can't find santosh: Non-existent domain*
C:\Documents and Settings\Srinivasam>ipconfig /all
Windows IP Configuration
Host Name . . . . . . . . . . . . : Srinivasam
Primary Dns Suffix . . . . . . . :
Node Type . . . . . . . . . . . . : Unknown
IP Routing Enabled. . . . . . . . : No
WINS Proxy Enabled. . . . . . . . : No
DNS Suffix Search List. . . . . . : westell.com
Ethernet adapter Wireless Network Connection:
Connection-specific DNS Suffix . : westell.com
Description . . . . . . . . . . . : Intel(R) Wireless WiFi Link 5100
Physical Address. . . . . . . . . : 00-21-6B-24-7D-FE
Dhcp Enabled. . . . . . . . . . . : Yes
Autoconfiguration Enabled . . . . : Yes
IP Address. . . . . . . . . . . . : 192.168.1.36
Subnet Mask . . . . . . . . . . . : 255.255.255.0
Default Gateway . . . . . . . . . : 192.168.1.1
DHCP Server . . . . . . . . . . . : 192.168.1.1
DNS Servers . . . . . . . . . . . : 192.168.1.1
Lease Obtained. . . . . . . . . . : Wednesday, June 17, 2009 11:11:11 PM
Lease Expires . . . . . . . . . . : Thursday, June 18, 2009 11:11:11 PM
Ethernet adapter Local Area Connection:
Media State . . . . . . . . . . . : Media disconnected
Description . . . . . . . . . . . : Intel(R) 82567V Gigabit Network Conn
ection
Physical Address. . . . . . . . . : 00-1C-7E-7D-A2-B7

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First of all; it would be difficult to know less about Oracle than myself.
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*:37*
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Uptime                    0 days 3 hr. 13 min. 12 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
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