I lose wireless connection after 5 minutes, then I must disconnect from wireless network and re-connect to have internet access.

Might not have a wireless card installed ??

If your Toshiba Satellite notebook computer is equipped with a wireless Internet card, you can connect to a Wi-Fi access point by turning on the wireless switch on the side of the laptop.
However, the signal may not always be picked up by your wireless receiver; if that is the case, you will need to check your wireless-network settings and reconfigure the network connections manually.

Open the Network Settings program. Click on the Control Panel in your "Programs" bar and select "Network Settings."
This will give you options for modifying how you connect to the Internet.
Select "Connect to a Network" or "Show Network Status and Tasks."
Both selections will show you whether you are disconnected from the wireless network.

Select "Manage Network Connections."
This selection is located on the left side of the window; clicking on it will show you whether you are connected to a local area connection or wireless network connection.

Engage the wireless connection.
Turn your wireless switch to "On," then right-click on the wireless network connection.
Select "Connect/Disconnect."

Wait for the IP address acquisition.
It may take a few minutes for your Toshiba Satellite to pick up the signal and transmit your IP address.
When this is complete, you will see the word "Connected" next to the name of your wireless connection, and a series of bars that indicate signal strength.
Launch your favorite browser to access the Internet using the wireless connection.
http://forums.computers.toshiba-europe.com/forums/thread.jspa?threadID=18365

If your Toshiba Satellite notebook computer is equipped with a wireless Internet card, you can connect to a Wi-Fi access point by turning on the wireless switch on the side of the laptop. However, the signal may not always be picked up by your wireless receiver; if that is the case, you will need to check your wireless-network settings and reconfigure the network connections manually.

Open the Network Settings program. Click on the Control Panel in your "Programs" bar and select "Network Settings." This will give you options for modifying how you connect to the Internet. Select "Connect to a Network" or "Show Network Status and Tasks." Both selections will show you whether you are disconnected from the wireless network. Select "Manage Network Connections." This selection is located on the left side of the window; clicking on it will show you whether you are connected to a local area connection or wireless network connection. Engage the wireless connection. Turn your wireless switch to "On," then right-click on the wireless network connection. Select "Connect/Disconnect." Wait for the IP address acquisition. It may take a few minutes for your Toshiba Satellite to pick up the signal and transmit your IP address. When this is complete, you will see the word "Connected" next to the name of your wireless connection, and a series of bars that indicate signal strength. Launch your favorite browser to access the Internet using the wireless connection.

CONTINUAL DISCONNECTION OF WIRELESS CONNECTION
There are a few things that can cause you to lose wireless connection with your wireless router. 1. Weak signal strength, check the signal strength on your wireless card. If it is weak move the wireless router away from brick or concrete walls and if possible locate the wireless router higher up. 2. Have you secured your wireless router from people near your from unauthorized access? i.e. change the default password, setup encryption use WPA2 or WPA, change the default SSID, and turn off SSID broadcast, and for added protection, enable MAC address filtering which allows only the MAC address/es of your wireless card/s to connect to your wireless router. 3. You could be getting interference from electrical sources such as air conditioners, arc welders, washing machines etc. If so, the power supply to the wireless routers and computers etc should be connected to a surge protection power board, better still connect your computer equipment to an UPS (Uninterrupted Power Supply). 4. Check the channels of the wireless routers and access points in your area and change the broadcast channel on your wireless router to an unused channel or one that is currently used but has the weakest signal strength. This will minimize interference with your wireless router from other wireless routers and access points in your area.

CONTINUAL DISCONNECTION OF WIRELESS CONNECTION
There are a few things thatcan cause you to lose wireless connection with your wireless router.1. Weak signal strength,check the signal strength on your wireless card. If it is weak move thewireless router away from brick or concrete walls and if possible locatethe wireless router higher up.2. Have you secured yourwireless router from people near your from unauthorized access? i.e. change thedefault password, setup encryption use WPA2 or WPA, change the default SSID,and turn off SSID broadcast, and for added protection, enable MAC addressfiltering which allows only the MAC address/es of your wireless card/s toconnect to your wireless router.3. You could be gettinginterference from electrical sources such as air conditioners, arc welders,washing machines etc. If so, the power supply to the wireless routers andcomputers etc should be connected to a surge protection power board, betterstill connect your computer equipment to an UPS (Uninterrupted PowerSupply). 4. Check the channels ofthe wireless routers and access points in your area and change the broadcastchannel on your wireless router to an unused channel or one that is currentlyused but has the weakest signal strength. This will minimize interferencewith your wireless router from other wireless routers and accesspoints in your area.

WIRELESS (WIFI):
Step 1: Turn on the PS3
Step 2: Once on main menu go to settings and under settings select "Network Settings"
Step 3: Select "Internet connection settings" if prompted that you will be disconnected from the internet select "Yes".
Step4: Select "Easy" on types of installation.
Step 5: Select "Wireless" to choose what kind of internet connection you want.
Step 6: Select "Scan" to search for internet access points.
Step 7: Select your home connection when the screen comes up with all the found access points. If your home Internet access point requires a password enter the password when prompted and saveyour settings.
Step 8: Test the connection to check if you configured your settings right if successful you are good to go. If not go back and check your connection settings for your home internet access point. You are now connected to the internet!
HARDLINE (Wired): Must connect ethernet cable to PS3 before turning it on!
Goes like this: Arrows are the cable (===>)
Internet Line ===>Router ===>PS3
Step 1: Turn on the PS3
Step 2: Once on main menu go to settings and under settings select "Network Settings"
Step 3: Go to "Internet Connection" and select it to Enable it.
Step 4: Select "Internet Connection Settings"
Step 5: Select "Internet connection settings" if prompted that you will be disconnected from the internet select "Yes".
Step 6: Select "Easy" on types of installation.
Step 7: PS3 will automatically check your connection network setup and set the settings for you.
Step 8: The settings will appear and press x to save the settings.
Step 9: Test your connection if it was successful you will see succeeded nest to "Obtain IPAddress" and "Internet Connection" you are now connected to the internet!

If your wireless card in your computer/laptop has not been configured with your wireless router's settings then it cannot connect to the wireless router. That is why you lose Internet connect when you disconnect the LAN cable.
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

This is a massive and expensive network, which appears to require a full signal and configuration audit. It's quite possible that many of your problems are stemming from the APs you have already deployed being situated in suboptimal and conflicting locations, which is an issue with three-dimensional wireless networks.
I really don't see your problems being debugged by anyone short of an experienced on-site wireless network technician. I'm saying this as a person who tuns a one-man company serving two rural communities with wireless internet service.
Sorry.

i have a dell now [email protected]

You can try to power cycle your entire network (refresh).
This often happens when you have a large network.

1. power down ALL Computers and disconnect the desktop from the D-Link Switch.
2. turn off all SLAVE AP's first.
3. Turn off the Master AP and disconnect one end of the Ethernet.
4. Turn off the D-Link Switch and disconnect one end of the Ethernet.
5. Now, turn off your modem.

Leave them for about 10 to 15 minutes, depending on your urgency.
Turn on and connect all devices in the EXACT order.

1. Turn on the modem. wait 2 minutes.
2. Turn on the D-Link Switch and wait 1 minute. Then connect the Ethernet to the MODEM.
3. Turn on the Master AP and wait 1 minute. Then connect the Ethernet to the D-Link Switch.
4. Turn ONE of the Slave AP's. Turn on your Laptop. try to connect to the Internet. If successful, Disconnect from the network on the computer and proceed to turn on the rest of the Slave AP's, Laptops, and Desktop. If its NOT successful, power on the Desktop and try to connect to the internet.

• If the desktop connects to the Internet, Check your D-Link's homepage "192.168.1.1" (default) for any wrong settings. If it does not connect, check your DSL Modem's settings.

If the above does not work, post what you did the day before this happened. Probably something small might have messed with the network.

the signal strenth is always good>and try this login to ur router and change the channels use 11>or 1>and delete all temp files and cookies and clear history>and reboot the lap top also>and rate me solved if its helped