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You need to check first if the wireless switch is turn on.If it is on, check the function key for the wireless. Some computers have function key. Sometimes it is combination of fn and f5. Press those keys at the same time and you should see a pop up window and check if the current status is on. If it is on, uninstall/reinstall the wireless driver in device manager. and restart your computer. If this didn't work. You need to do re installation of your operating system.
is ur WIFI connected thru USB ?
then ur USB is losing power...
check if ur USB setting...
go to Device Manager/USB Serial Bus/USB root hub...
go to each ports one by one....right click on each check properties...check Power Mgt tab....
remove the Tick in the box that says "Allow computer to save power'....
close Device Manager/ Shutdown and restart....
I suggest going into the control panel/device manager and removing all the usb devices. Restart the computer and let it find the devices again. That might help. Also--have you tried the stick in another computer just to make sure it works?
Things you can do to try and improve the connectivity are:
1. Update the system BIOS to the latest version
2. Update the wireless driver to the latest version (Both are available at support.dell.com)
3. Try a different channel for wireless on your router (Most default to channel 6, so try 1 or 11)