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Check the settings and see if there is a way to turn the power up. Do you have another wifi card you can try? If other wireless cards connect from 100 feet with no problem it might be your wireless card.
Check the distance bet computer and the Router.
Donot keep your router near television, microwaveoven or any radio active devces, it may reduce the performance.
Check the Antena terminals for any loose connections.
If possible check your wireless signal strength with another Laptop, to diagnose the router is working fine.
If everything seems to be fine, it maybe the issue with the Adapter.
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? ie. 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.
Make sure there is no interference, such as microwaves or cell phones that operate at 2.4ghz. Do you have many thick inside walls between your router and your computer? You could try a signal boosting antenna to attach to your router.
What virus checker are you using? Is there also a different firewall apart from the windows one. If you have blocked your connections it will prevent you from using your wireless effectvely. Uninstall or disable the virus checker and see if the same happens. Also are you using E internet, try mozilla firefox and see if the same happens.
Another thing to check is if the adapter is using the windows manager properly. What you need to do to check it follow the following instructions.
Click on start and choose CONNECT TO option and click on your wireless adapter. (Wireless network connection)
Click on View Wireless networks
Scroll on your network connection and then click on change advanced settings
Now double click on Internet Protocol TCP/IP
Make sure both settings are set to automatically detect DNS address and IP address
Then select apply if need to change and ok to continue
Now click on the Tab Wireless Networks
Wait a few seconds and Now make sure the top box which says "Use windows to configure my wireless network" has a tick next to it, if now click on box.
Click on Apply and ok, or just ok if no apply option
Close all windows and restart computer.
Now see if the device connects and click on your browser and see how it works.
Any questions if still not working please give details.
if you are using the dell wireless utility to manage your card, then disable it, and manage your wireless adapter through the windows network connections. that way the wpa issue will be solved by windows xp wpa. i had a similar problem with my inspiron 1525 (dell wireless 1395)
There are several problems reported that may cause disconnection. First is the hiding of the SSID (wireless network name) and enabling WEP or WPA encryption. The recommended solution for that is to unhide the SSID in the router configuration.
Second is that there are more and more wireless devices and occasionally interference occurs on a single channel (even from non computer devices like wireless phones. As routers are often set to channel 6 you may be competing for radio communications with your neighbors. The recommendation is to switch the router to either channel 1 or 11. If your first choice does not work try the other.
it may be as simple as the wireless connection signal strength, as doors, solid walls or any solid object that is in it's line will cause the signal to be very low, and at that point it will disconect from the internet as it is unable to send packets of information to your wireless card from the router.
You can try your router in another telephone point that is nearer the pc to see if the connection drops, or use a different channel number which can be changed in the routers settings and the wireless cards properties as interference from other electrical appliances on the MHZ level can cause signal loss.
Laptops tend to suffer less with the signal loss because they normally have a signal booster in the screen of the laptop within the wireless receiver ariel.