My computer connects to the wireless network but i cant access the internet

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

Having a wireless Internet signal in your home allows multiple devices to use the same Internet connection without having to run lengths of Ethernet cable to each device. Given that the wireless network is transmitted over the air, the consistency of your Internet connection depends on the strength of the wireless signal. If wireless signal strength is not strong enough to give you a consistent Internet connection, there are a few simple steps for finding the problem and improving your signal strength.

Reset all devices. The majority of Internet issues, including poor wireless signal strength, are very often solved by a simple power cycle of all the devices in the network. Locate the power cords of both your modem and your wireless router and remove them (if you use a modem/router combination, simply unplug the power to that device). Leave them unplugged for a full 30 seconds, plug them back in and restart your computer. When your computer fully reboots, check your wireless signal strength to see if it has improved. If it has not, further troubleshooting is required. Move your computer closer to your router, or your router closer to your computer. Wireless routers do not have unlimited range. One reason your computer may be getting a weak signal strength from your wireless network could be because your computer is simply outside of the router's range. Typically, ISPs (Internet Service Providers) will install your modem in one specific location in the house and the modem will not work at other locations, so moving the modem or modem/router combination may not be a possibility. If this is the case, you may need to move the computer to a location that is within the range of the wireless router's broadcast. If you still get poor signal strength, your router may be experiencing a malfunction. Contact the technical support department of your router manufacturer. Router malfunctions often are not the result of a bad or broken router, but of something much simpler, such as the router's needing a firmware upgrade or an incorrect setting on the router's internal setup. If your router manufacturer is unable to improve your wireless signal strength, it may be time to purchase a new router. Purchase a new router. Wireless routers are priced in part based on how widely their wireless signal broadcasts (in other words, the more expensive the router you buy, the larger a wireless signal the router will broadcast). Included in the packaging of each wireless router is the approximated range, in square footage, of that router's wireless network. A good rule of thumb is to know the square footage of your house and buy a router that can accommodate that square footage. That way, as long as the router is functioning properly, you will have strong wireless signal strength throughout your entire home.

Possibly the power outage caused your modem to reset. The wired connection would still work. first thing I would try is to reset the modem with the reset button, login to the management console and put in your network name and password again.

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.

Can you connect to the Internet using the LAN cable?
Have you configured the wireless card in your laptop with the router's wireless settings?

Network Key (WEP, WPA, WPA2 Encryption key)To connectyour computer to a wireless router, you click the Refresh networklist, then Choose your wireless network and then click Connectto your secured Wireless Network, it will asks for a Network Keybefore allowing you to connect into your wireless network. This NetworkKey is either the WEP, or WPA or WPA2 Encryption key that is used toconfigure the Wireless Router. The Passphrase is an alternate way tosetup the Encryption key.
When you are requested for a Network Key, you can just enter the Passphrasethat was used to configure the Encryption key in the wireless router.http://www.fixya.com/support/r5270415-network_password_network_addressFor information on securing your wireless network,configuring the wireless router and configuring the wireless card in thelaptop/computer, please click on this link and follow my instructions :-http://www.fixya.com/support/r3559128-wireless_router_security

Your computer may be picking up the wireless networks in your area including yours but you still require to configure your computer to the router for which you will require to go through the manual which came along with the router/modem. If you are a computer savy man you can do it yourself otherwise you will require services of technical person.

The wireless card in the notebook needs to be configured with thw router's wireless setings ie. the SSID and the encryption settings.
To secure your wireless network from unauthorized access and toconfigure the wireless card in the laptop/computer, please click on this link and follow my instructions :-
Normal 0 http://www.fixya.com/support/r3559128-wireless_router_security

You are getting local access only.
Right click on the icon in the system tray and click repair....

If it still happens you need to connect to a different network..this usually happens if you are connecting to an unsecured network (I assume yours).

Alternative: Unplug the network adapter. Turn off the computer. Wait approx 2 minutes.
Power on computer with net adapter connected....

it may be wrong product key. other try the following options. 1.click on start 2.click on run in case of window xp 3 type in ncpa.cpl(in case vista type ncpa.cpl in the start search box at the bottom.) 4.click on manager wireless connection 5. delete all of the wireless connction 6 now, right click on the two computer icon at the botton right corner in the task bar just besides the time clock. 7. click on connect to the network. 8. choose your network and enter the key. you will be connected.

Try this:

Plug ito your router with a network plug (ethernet adaptor) in a web browser enter the router access code (192.1.1.100) or check with your router manual to access the router. once in the router add the PC to the network this should allow you to access the network at full strenght