I have installed two operating systems.I can suffer internet under linux but can't under windows.In windows,it shows local area connection is connected but there is no more internet.I have to restart and go to ubuntu to suffer internet.The ip to suffer internet is obtained automatically in both systems.What is the solution i can't understand.

In Windows:
Start/Run/cmd
ipconfig /all
Right click in the command window and choose Select All, then hit Enter to copy the contents to the clipboard.
Paste the results in a message here.

Microsoft Windows XP [Version 5.1.2600]

(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\gautam>ipconfig/all

Windows IP Configuration

Host Name . . . . . . . . . . . . : KANCHHA

Primary Dns Suffix . . . . . . . :

Node Type . . . . . . . . . . . . : Unknown

IP Routing Enabled. . . . . . . . : No

WINS Proxy Enabled. . . . . . . . : No

DNS Suffix Search List. . . . . . : ioe.edu.np

Ethernet adapter Local Area Connection 4:

Connection-specific DNS Suffix . : ioe.edu.np

Description . . . . . . . . . . . : Realtek RTL8139/810x Family Fast Ethernet NIC

Physical Address. . . . . . . . . : 00-1D-92-BB-5E-BD

Dhcp Enabled. . . . . . . . . . . : Yes

Autoconfiguration Enabled . . . . : Yes

IP Address. . . . . . . . . . . . : 10.200.0.56

Subnet Mask . . . . . . . . . . . : 255.255.0.0

Default Gateway . . . . . . . . . : 10.200.0.1

DHCP Server . . . . . . . . . . . : 10.200.0.1

DNS Servers . . . . . . . . . . . : 202.70.91.9

202.70.91.8

Lease Obtained. . . . . . . . . . : Sunday, February 08, 2009 6:47:58 PM

Lease Expires . . . . . . . . . . : Sunday, February 08, 2009 6:57:58 PM

C:\Documents and Settings\gautam>

That looks OK, I think.
At the command line:
ping 10.200.0.1
and post the result.
Open a terminal window in Ubuntu:
ifconfig
post the result

The ip 10.200.0.1 provides us an internet.We have to log on a username with password provided by our provider.While I opened mozilla firefox( or any other browser ) browser says the page http://10.200.0.1/........ is incripted,and would you like to get certificate for it? If i get certificate of the page,then login page opens.After logging in,for example ,I type google.com on address bar,it opens the google home page.Some one-two pages opens.After a while it says page load error.I have to re-start to open ubuntu.In ubuntu there is internet with no such problems.One interesting thing is that ,as soon as I logged in,(at the time of opening some 1-2 pages) if I started some downloads through Download Managers,it continues downloading while browser can't browse the pages.It means somewhere there is internet,but browser can't accsess in win-xp.I will post ,you have said above, later.

eth0 Link encap:Ethernet HWaddr 00:1d:92:bb:5e:bd
inet addr:10.200.0.104 Bcast:10.200.255.255 Mask:255.255.0.0
inet6 addr: fe80::21d:92ff:febb:5ebd/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:87063 errors:0 dropped:0 overruns:0 frame:0
TX packets:5930 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:13072020 (12.4 MB) TX bytes:858534 (838.4 KB)
Interrupt:221

lo Link encap:Local Loopback
inet addr:127.0.0.1 Mask:255.0.0.0
inet6 addr: ::1/128 Scope:Host
UP LOOPBACK RUNNING MTU:16436 Metric:1
RX packets:1046 errors:0 dropped:0 overruns:0 frame:0
TX packets:1046 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:0
RX bytes:52300 (51.0 KB) TX bytes:52300 (51.0 KB)

for windows:

Begore Logging in:

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\gautam>ping 10.200.0.1

Pinging 10.200.0.1 with 32 bytes of data:

Reply from 10.200.0.1: bytes=32 time<1ms TTL=64
Reply from 10.200.0.1: bytes=32 time<1ms TTL=64
Reply from 10.200.0.1: bytes=32 time<1ms TTL=64
Reply from 10.200.0.1: bytes=32 time<1ms TTL=64

Ping statistics for 10.200.0.1:
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\gautam>

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