Lets start our internet troubleshooting campaign with the BSNL connection one of the most sought after as they provide a good 2Mbps connection.

This guide is especially for DATAONE MODEM users

Goto any browser of your choice

Type 192.168.1.1 in the address bar

if you get a login screen as below then goto next post

otherwise just goto START--->CONTROL PANEL->NETWORK CONNECTIONS-->LOCAL AREA CONNECTIONS

right click on it select properties and select TCP/IP and select PROPERTIES and set IP address as 192.168.1.2 and subnet mask as 255.255.255.0 and sefault gate way as 192.168.1.1 and select save and close

click on ADVANCED SETUP

select WAN

you will get a screen as below in case the modem is preconfigured

otherwise there will be no connection shown

Now click on ADD

vpi  VALUE AS 0

vci VALUE AS 32

SET service category AS UBR Withot PCR

click on NEXT

select PPP over ethernet(PPPoE)

encapsulation mode as LLC/SNAP BRIDGING

click next

set authentication mode to auto

enable bridge pppoe frames between WAN and Local ports(default enabled)

CLICK NEXT

click on enable wan service
click next 

SAVE THE CONFIGURATION AND REBOOT

With the exception of your DSL router, ensure that all devices plugged into the phone line, including fax machines, satellite receivers, and alarm systems, have a DSL line filter on them. These filters prevent interference with your DSL signal. The DSL router should be the only unfiltered device on the phone line.

In case of PPOE login into the modem and check if the PPPOE id password are correct.

More information on logging into the modem and PPPOE will be posted later

If possible, remove any Inrtermediate devices that sit between your computer and the DSL router.

They may be

Hubs

Wireless routers

Network switches

Vonage phones

VOIP phones

Wired Routers etc........

Connect your computer directly into the DSL router so that you can eliminate the

possibility that another device on your network is causing the problem.

Restart the Computer 

Reboot DSL Router

Rebooting the router causes it to re-synchronize the DSL signal and the network connection to your computer.
Turn the DSL Router off and unplug the power cord of it. Then wait 30 seconds
Plug the powercord back into the DSL Router and turn it on. Wait another 30 seconds

Power LED Status 
Check the status of the LED lights located on the front panel of the DSL modem. “POWER” or “PWR” should be lit solid. If the power light is unlit or is flashing, tryhe following:
Ensure that the power supply is plugged in securely, both at the wall outlet and at the back of the DSL router
You may need to try a different wall outlet.

- Set Format to Mode 1.

- Set Character Set to ISO 9660 (standard ISO CD-ROM).

- Check all Relax ISO Restrictions.

- Check Allow more than 64 characters for Joliet names.

ENTER X2PVOL_EN AS THE DISK NAME

Enter the Volume Label AS X2PVOL_EN into the System Identifier AND Volume Set

Enter MICROSOFT_CORPORATION in Publisher,Data preparer

Enter Nero Burning ROM in the Application text boxes

- Check Write.

- Click the New button.

thats it compilation completed and bootable disk ready

Microsoft added the ability to Slipstream a Service Pack to Windows 2000 and Windows XP. It not only has the advantage that when you (re)install your OS, you don't have to apply the Service Pack later, also if you update any Windows component later, you'll be sure that you get the correct installation files if Windows needs any.

Download the "Network Install" of the Service Pack (English version [266 MB]), and save it to a directory (folder) on your hard drive (in my case E:\XP-SP2).AVOID using spaces in the folder name! 

Next copy your Windows XP CD to your hard drive. Just create a folder (I used E:\XP-CD), and copy all the contents of your Windows XP CD in that folder.

Next, open a Command Prompt

(Start > Run > cmd), and go to the folder where you downloaded SP2 (E:\XP-SP2).

Type the command: servicepack filename /integrate:drive/path.

In my example the command is WindowsXP-KB835935-SP2-ENU /integrate:E:\XP-CD.

When ready, you should get a confirmation. Windows XP Service Pack 2 has now been Slipstreamed into your original Windows XP files.

Issues with the computer memory.

Delete all program temporary files