I have D-Link DSL-2640T Wireless ADSL2/2+ Router It works OK. I add another wirless point by the electrc socket on wall so I can use at any place at my home. The problem is : the wirless device I connected by the electrcity socket has no security , so every one is using it. How can I make it secured ??

To secure your wireless network from unauthorized access,please click on this link and follow my instructions :- http://www.fixya.com/support/r3559128-wireless_router_security

Hello,
Download and install free open source Router Commander software from www.routercommander.com. After problem happens, see in router commander's syslog what the reason is.

open the access points in the internet explorer
in it set the wireless security to WEP and provide the network encrypted password

This one can be one of two things.

If you have a digital multimeter, check the power connection and make sure that it's not to high (eg. 7.5 V DC should read no more than 7.8 V for it to work properly)

Otherwise, just reset the router. I have a feeling it is the first one.

Once it reaches to 130% above of what's rated, it can fry your network adapter in your computer and possibly more damage if it's wired.

Follow
anurdh65 solution...........

Dear,
Please refer this. In case of any issue, please let me know http://www.dlink.co.in/Upload/UploadDownload/DSL-2640T.pdf

Try diagnose and repaire the connection if that does not work Reset your modem it should go back to default manufacture setup.Then turn modem off and connect any computer or laptop to the modem with ethernet wire turn the modem on go back to your computer that you are connected to modem with wire go to network connections and disable the wireless Network connection and enable local area connection once you see you have connected and have internet working go to start menu you can do this on the start search bar with vista or run with any other windows version type cmd and press enter, it should bring a DOS command menu and then type in ipconfig and enter scroll up and down to where you see default gateway type that ip address to your internet browser it should take you to login screen username should be administrator password admin setup your WEB key make the wireless access available DO NOT FORGET to write the web key down, give a name to the connection and change the default password from admin to something you can remember. save the settings and turn that off keep the laptop on. Then unplug the ethernet cable and switch the network connectiion again enable wireless disable local area also you need to scan the available wireless internet and pick the one you just named use the webkey to access and save when the connection in made.

go to your mom and ask if they know how to fixed that problem that you have ,, tc hahaha

could you able to solve.pse share

If this laptop has a wireless switch, make sure it's on.
Did you get the wireless hub?
Wireless is controlled by the wireless zero service, which should turn on automatically when your adapter is detected.
You can turn it on manually in Control Panel/Admin Tools/Services