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This is Nishit Jadawala from Ahmedabad, India.
I am also having the same problem with my Sony Vaio VGN-CS21GN Laptop. WiFi was working perfectly in Vista but when I downgraded it to Windows-XP it started giving me errors that "Driver Not Found for the Device" I have downloaded all the drivers available on internet but nothing worked.
Finally after 8 months of research on this problem, I came to know that there is a bug in the supplied Windows XP-SP3 Operating System. There is a file in Service Pack 3 that doesn't allow drivers to access the hardware of WiFi.
The Solution is you will have to forget the bundled windows XP and upgrade your operating System. Right now better option is to go for windows 7. It dint even asked for any kind of drivers to load. WiFi is also working perfectly on it. The laptop has become more faster & smoother than in windows XP.
For more queries, you can write to me on email@example.com
Thanks & Regards,
Nishit Jadawala (Film & Media Professional)
Ahmedabad - INDIA
not a problem in xp sp3 under the device manager in system properties you will have a yellow circle and black exclamation mark and probably say unknown device or ethernet device. right click go to properties and in details tab you will see Device ID.. we can track OEM driver from this.
Well because I guess you won't use it all the time a dongle is a better choice, it won't **** extra energy from the laptop's battery all the time, it's easy to disconnect it and you'll still have the card slot for something else like a TV card or whatever.
But if you are OK with dismentaling your laptop and doing some soldering stuff and put it together again than you should try out something like this.
http://driveragent.com/?PHPSESSID=mo2vsr6totpdv8u9rr8ea8ldi3 download the driver agent from the above link,install and find the correct name of the driver needed by the system.Either google the result or go the VIA download site to download the same http://www.viaarena.com/default.aspx?PageID=2&Type=1&OSID=1