I cannot access an Internet in one of my computers

If it works sometimes ? when you unplug it then replugging it back in something is wrong with the modem / router or they might need to be reset .
or firmware upgrade
Reset linksy router b> One of the most common fixes for Internet connectivity often involves resetting the source of your Internet connection. If you have a DSL or cable Internet connection, you may use a Linksys router to get on the Internet. When you reset a Linksys router, you'll likely solve your connection problem.

Turn off the power to your computer's modem. Use the switch on your cable or DSL modem to disable it while you reset the Linksys router. Find the reset button your Linksys router. Most Linksys models have the reset option on the back of the router. Use a pointed pen or pencil to press in the reset button on your Linksys router. Hold down the reset button for approximately 30 seconds. Watch the lights on the front of the router. After you reset the router, power will get restored to the Linksys router. Once power's available, you can switch the modem back on. Reconfigure your router. After you reset your router, you'll have to log in and reconfigure your settings. The login name is typically left empty with your password as "admin."
Reset a Linksys Wireless Router b> You may need to reset your Linksys wireless router if you are having Internet connectivity issues or other networking problems. You can reset the router to the default factory settings, such as the default IP (Internet protocol) address, username and password. However, after you perform the factory reset, you can follow the initial setup instructions to replace your previous settings.

Write down any important settings you may have--such as the router's password--before you reset the router. Locate the reset button on the router. Some Linksys models have a reset button on the back side. Other Linksys models have a small pinhole you may need to access by using the tip of a pen or pencil. Press and hold the reset button for a minimum of 30 seconds to perform a factory reset on the Linksys router. The Linksys router should lose power. Power on the Linksys router to initiate the configuration wizard. Reconfigure any previous wireless settings on your Linksys router.

Hope this helps.
b>

The router can be set to factory default by performing either of these two steps:

Resetting the Router Using the Reset Button
Resetting the Router Using the Web-Based Setup Page

NOTE: Pressing the Reset button on the back of the router for 30 seconds will reset your router to its factory default settings. All of the settings of the router will then be erased and the router's IP address will become 192.168.1.1.

To perform a hardware reset on your Linksys router, follow these steps:
Resetting the Router Using the Reset Button
Step 1:
Take note of the current settings of the router before resetting.
Step 2:
Press and hold the Reset button of the router for 30 seconds.

Figure 1: Location of the Reset button on a Linksys BEFW11S4 router.
NOTE: The image may vary depending on the model number of the Linksys device.

Figure 2: Location of the Reset button on a Linksys WRT54GX router.

Figure 3: Location of the Reset button on a Linksys WRT54GC router.
NOTE: If the image of your router looks different from the ones shown above, consult your router documentation.
Step 3:
If the normal reset does not work, try to press and hold the Reset button for three seconds. The Ethernet light should go OFF then back ON. Unplug and re-plug the router's power adapter while pressing the Reset button. Keep holding the reset until the power light stops blinking.
NOTE: The router must be powered ON when you press the Reset button.
To reset the router via its web-based setup page, follow the steps below.
Resetting the Router Using the Web-Based Setup Page
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the router's web-based setup page using a Mac computer, click here.
Step 2:
When the router's web-based setup page appears, click Administration then click on Factory Defaults.

NOTE: If the screen on your router's web-based setup page looks different, click here.
Step 3:
Click on Restore Factory Defaults and select Yes.

Step 4:
Click OK.

Related Articles:

Accessing the Router's Web-Based Setup Page
Setting-Up a Router with Cable Internet Service
Setting-Up a Linksys Router Using DSL Internet
Changing the Linksys Router's Password

Try:
Resetting the Linksys Router to Factory Default

The router can be set to factory default by performing either of these two steps:

Resetting the Router Using the Reset Button
Resetting the Router Using the Web-Based Setup Page

NOTE: Pressing the Reset button on the back of the router for 30 seconds will reset your router to its factory default settings. All of the settings of the router will then be erased and the router's IP address will become 192.168.1.1.

To perform a hardware reset on your Linksys router, follow these steps:
Resetting the Router Using the Reset Button
Step 1:
Take note of the current settings of the router before resetting.
Step 2:
Press and hold the Reset button of the router for 30 seconds.

Figure 1: Location of the Reset button on a Linksys BEFW11S4 router.
NOTE: The image may vary depending on the model number of the Linksys device.

Figure 2: Location of the Reset button on a Linksys WRT54GX router.

Figure 3: Location of the Reset button on a Linksys WRT54GC router.
NOTE: If the image of your router looks different from the ones shown above, consult your router documentation.
Step 3:
If the normal reset does not work, try to press and hold the Reset button for three seconds. The Ethernet light should go OFF then back ON. Unplug and re-plug the router's power adapter while pressing the Reset button. Keep holding the reset until the power light stops blinking.
NOTE: The router must be powered ON when you press the Reset button.
To reset the router via its web-based setup page, follow the steps below.
Resetting the Router Using the Web-Based Setup Page
Step 1:
Access the router's web-based setup page. For instructions, click here.
NOTE: To learn how to access the router's web-based setup page using a Mac computer, click here.
Step 2:
When the router's web-based setup page appears, click Administration then click on Factory Defaults.

NOTE: If the screen on your router's web-based setup page looks different, click here.
Step 3:
Click on Restore Factory Defaults and select Yes.

Step 4:
Click OK.

Related Articles:

Accessing the Router's Web-Based Setup Page
Setting-Up a Router with Cable Internet Service
Setting-Up a Linksys Router Using DSL Internet
Changing the Linksys Router's Password

Go to Linksys and start a new configuration.

folow the reset options in the manual that came with your router.

become familiar with how to reset the router.

use the admin password when resetting the router

let the software guide you thru trouble shooting

From ethernet of embarq plug it to the Internet port of Linksys. Your PC should be connected to port 1 of Linksys

The following routers are the only models that support the AOL Broadband Cable service. Note: All Linksys routers support AOL DSL connections due to the standard PPPoE login and authentication connection type used with that service. Please be sure to check the version number of your router (which can be found on the underside label). Only the specific models and versions listed here are supported by AOL Cable: * BEFW11S4 * BEFW11S4 v2, v3, and v3.2 * BEFSR41 * BEFSR41 v2 * BEFSR11 * BEFSRU31 * BEFSR81 * BEFSR81 v2 * HPRO200 (Available from AOL only at this time) You must Enable the "AOL Parental Controls" option located in the Security tab of the web-based Setup utility pages of these routers in order to get a connection using AOL Cable. You may access the utility by visiting http://192.168.1.1 in a web browser and by logging in using the router's password (by default, the password is admin).

The 100 series (1Mbit) supports up to 25 computers. The 200 series (10Mbit) supports up to 30 computers.

Yes, the HPRO200 supports multiple IPSec connections.

Unfortunately the unit is not a DSL modem. The unit does use phone lines, and can use the same phone number as your DSL Line, however the unit does not act as a DSL modem.