No WiFi adapter found after windows 10 upgrade

Yesterday I upgraded to Windows 10 from Windows 8.1 but after the upgradation the WiFi does not works.There was no WiFi adapter found and the same goes for Bluetooth.Please assist from where can these drivers be downloaded

 I had no wireless after updating my Pavilion DM4 3002ea to Windows 10 Home 64bit. None of the solutions on here worked for me but I stumbled across the solution when I'd given up and decided to re-install Windows 7. I think the problem arises when you instal Windows 10 without the wireless adapter being switched on so ...  1. Set the BIOS to boot from CD/DVD first2. Boot from Windows installation DVD and once it loads to the installation screen I found I could switch the wireless adapter on.3. Once the wireless adapter is switched on remove the Windows installation DVD from the drive and boot as normal to Windows 10 and "hopefully" you will be able to switch off Flight mode and input your wireless network details

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