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After trying the Ubuntu 12.04 demo cd, wifi has stopped working on my Windows vista machine. Before demo cd, wifi worked fine inside Windows

During demo CD (and every time I use it), WiFi works fine inside Ubuntu 12.04. Since first time I used demo CD, WiFi does not work anymore inside Windows vista. Windows says the hardware switch for WiFi is off, but it is on (and must be since it works under Ubuntu)

rfkill list all 

Shows no blocks inside Ubuntu, but Windows still says hardware switch is off ever since the first time I used demo CD from Ubuntu

rfkill unblock wifi 

has no effect

sudo lspci -v 

shows network controller is Intel PRO/Wireless 3945ABG [Golan] rev 02 and ethernet controller is Realtek RTL8111/8168B PCI Express Gigabit rev 01

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should have mentioned this - sudo lspci -v shows network controller is Intel PRO/Wireless 3945ABG [Golan] rev 02 and ethernet controller is Realtek RTL8111/8168B PCI Express Gigabit rev 01 –  howard May 11 '12 at 12:44
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you can always edit your question and add the details –  Sathya May 11 '12 at 16:52
    
Once I was also experienced this problem with my Compaq system and I used HP Support application to turn wireless back in to operation.I think you someway unchecked the "enable wireless" on Network menu.This caused me on that occasion,after that I did not have done such a mistake. –  beeju May 11 '12 at 18:08
    
If it is a laptop have you tried to shut it down and remove the battery for a minute? In either case you can try to reinstall it under Windows. It seems to me that the problem might be that there might be firmware needed for your Realtek and the Ubuntu firmware might be incompatible with Windows. The trick might be to find a way to get Windows to load the firmware it has for the device. –  John S Gruber May 18 '12 at 20:06
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