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Go to Dell and download the driver from there. The MS driver doesn't actually control the device, only controls function after device is active and working. Look on the bottom or back of the computer for the Dell service tag number, and use this to identify the correct device and get the device drivers. You may also find some other things there that weren't installed by the OS.
Uninstall and reinstall LAN drivers and Broadcom drivers.
Press Windows key and R key simultaneously to open Run Window.
Type "devmgmt.msc" and click on OK.
This will open Device Manager.
Click on "+" sign next to Network Adapters and right click on the network adapter and select Uninstall.
After uninstalling right click on Network Adapters and select scan for hardware changes.
This will reinstall the drivers.
Sometimes windows prompts you to restart the computer to reinstall the drivers automatically.
You can even reinstall the new LAN and Broadcom drivers from your Dell website
provided they have new version of these drivers.
After reinstalling the drivers, check if the adapters work.
If the adapters still don't work, the issue could be with the hardware.
You may even try with recovering your PC using Dell Factory Recovery.
Before performing Recovery, take the backup of your hard disk as the Recovery process will restore your notebook completely to factory settings.
You might find it difficult to get hold of windows XP keys since Microsoft stopped selling it.
If you get on google and search for something called TinyXP (rev09). I think that this willl solve your problem.
Broadcom is not wireless, but the normal ethernet controller.
You should go to intel / your laptop manufactuer website and download the appropriate drivers.
u can get cd key on www.torrentreactor.net by writing " key for dell inspiration 1521 " or on google write "key for dell inspiration 1521 for windows or vista" or ucan go on www.freekey.com
Your resolution will most likely be a replacement of the motherboard. You can try flashing the BIOS and see if that resolves, but from your details it appears there is a hardware failure of the motherboard. Generally, you can find a motherboard for this model on Ebay for around $100
checklist:
1. sound driver
2. microphone settings in volume control applet
3. tap test (tap the area around the microphone and see if eg Sound Recorder picks it up)
4. external microphone
If you get to step 4 before you get anything then your problem is one of missing or damaged microphone.
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