Hello everyone, if anyone has had the horrible task of trying to get his or her bluetooth working after upgrading to windows 8.1, then look no further. It took me hours and hours of faffing and fist raging, but in the end, there can be only one. Anyway...Here is your solution.....Ps! I already upgraded to Windows 10, but went back to 8.1 as it trashed my PC and cost me 3.5 half days of painstaking re-install to get my laptop to work again. (WINDOWS 10...DONT BOTHER IN MY OPINION) I have : ACER V3-571 64 BIT WIN 8.1 AGAIN. . IF YOU UPGRADE THIS LAPTOP TO WINDOWS 10...YOUR DOLBY V4 WILL STOP WORKING...was the start of a new nightmare for me. MICROSOFT UPGRADE YOUR ACER WITH THEIR OWN DRIVERS WHEN YOU UPGRADE TO A NEW OPERATING SYSTEM, OFTEN THIS LEADS TO STUPID FIDDLY THINGS LIKE APPS AND APPLICATIONS NO LONGER WORKING.... SO here we go!!!
SOLUTION TO BLUETOOTH NOT WORKING V3-571 ACER WIN 8.1 64
-----------------------------------------------------------------------------------
1) Switch off your bluetooth .........search top right screen > Settings > Bluetooth > Toggle off!
2) Right Click your windows logo on the left hand side of your screen > device manager > Bluetooth >Uninstall totally the bluetooth driver and or delete.
3) Exit device manager.
4) www.google. > find acer drivers > acer website. On website to find drivers, use auto detect serial number > go to your downloads folder >open downloaded auto detector > copy serial number> back to asking box for your serial number >right click > Paste serial number.
5)Select operating system from drop down menu (typically windows 8.1)
6Drivers > Select Bluetooth Qualcom Atheros Driver 64
7) Go to downloads on your pc
8) Right click the downloaded bluethooth qualcom atheros zip folder > > extract here
9) Go into unzipped bluetooth folder > Double Click the installer Icon > Run installer
10) Restart PC
11) Boom!!! Happy Days.....Nightmare over. YOUR BLUETOOTH WILL NOW CRUISE




Hope this will help other people, I had a nightmare for a good few hours trying to get my bluetooth to work again after upgrading to Win 8.1 FROM Win 8.