How to turn on Bluetooth in Windows 8.1. Go to the top right of your PC and open the Charms bar. Open the Settings option and select PC Settings. In the new window that you will see, select the category PC and devices. This part is the function of Bluetooth. Turn on the Bluetooth option and have your computer start looking for peripherals around it. In Windows 8.1. Turn on your Bluetooth device and make it discoverable. The way you make it discoverable depends on the device. Check the device or visit the manufacturer's website to learn how. Select the Start button type Bluetooth select Bluetooth settings from the list. Turn on Bluetooth select the device Pair. Use the following steps to turn on Bluetooth in Windows 8.1. Press the Windows key + C to open your Charms. Select the Settings charm, and then click Change PC settings. Click on PC and devices and then select Bluetooth. Move the Bluetooth toggle switch to On. Open Settings, and click/tap on the Devices icon. Click/tap on Bluetooth & Other devices on the left side, and turn on or off Bluetooth on the right side. (see screenshots below). When finished, you can close Settings if you like.
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'i found a patch, the was dated 3 months after the initial one on my system, that for some reason the 'SONY VIAO Updater' was not catching, i applied the patch myself, and guess what, im on windows 8.1 with no issues now.'
My Bluetooth is not working after upgrading to windows 8.1
http://malwaretips.com/threads/my-bluetooth-is-not-working-after-upgrading-to-windows-8-1.19729/
How to turn on/off Bluetooth on Windows 8.1
http://superuser.com/questions/612742/how-to-turn-on-off-bluetooth-on-windows-8-1
How to enable Bluetooth in Windows 8.1
http://acer-au.custhelp.com/app/answers/detail/a_id/32026/~/how-to-enable-bluetooth-in-windows-8.1

https://www.google.com.au/search?q=Turn+On+Bluetooth+in+Windows+8.1&sourceid=ie7&rls=com.microsoft:en-AU:IE-Address&ie=&oe=&gfe_rd=cr&ei=_8A5U6DkEMTC8geYh4CYBA

If this is a recent occurrence then try fixing things via System Restore, or use the System File Checker.
How to repair the operating system and how to restore the operating system configuration to an earlier point in time in Windows Vista (or 7, or 8).
http://support.microsoft.com/kb/936212/#appliesto
See, Control PanelAll Control Panel ItemsRecovery Open System Restore
These days, most mobile devices come with Bluetooth. If you’ve got a reasonable modern Windows 10 laptop, it’s got Bluetooth. If you have a desktop PC, it might or might not have Bluetooth built, but you can always add it if you want. Assuming you have access to Bluetooth on your system, here’s how to turn it on and get it set up.
Enabling Bluetooth in Windows 10
In order to connect a device to your computer, you need to make sure Bluetooth is enabled. To do this, open up your Settings app by hitting Win+I and then click the “Devices” category.
On the Devices page, select the “Bluetooth & Other Devices” tab on the left. On the right, make sure Bluetooth is switched to “On.”
RELATED:Bluetooth 5.0: What’s Different, and Why it Matters
How To Turn On Bluetooth On Windows 8 Pro
Alternatively, you can turn Bluetooth on and off quickly by opening up the Action Center (hit Win+A or click the Action Center icon on the system tray). Here you can enable Bluetooth from the Quick Actions panel. The placement of the Bluetooth icon may vary from system to system, depending on how you have things configured.
RELATED:How to Use and Customize the Windows 10 Action Center
Pairing a Bluetooth Device
Now that Bluetooth is turned on, go ahead and turn on the device you want to pair and put it into Pairing Mode or Discovery Mode.
On your PC, the device should appear in the list of other devices in the Settings window. Click the device and click the “Pair” button.
Depending on the type of device you’re connecting, a confirmation window might pop up on both devices, asking if you want to pair the device. Here I was connecting my phone to my PC and this window came up, preventing just anyone from connecting to your computer. Verify the PIN is the same and then click the “Yes” button.
Pairing a Device that Doesn’t Show Up Automatically
If for some reason your device doesn’t appear below, click the “Add Bluetooth or Other Device” button located at the top of the Settings window.
Turn Bluetooth On Windows 7
Next, select what type of device you want to connect.
From the list of available devices, select the one you want to connect.
This should take you into the same pairing routine we discussed in the previous section.
Using Your Bluetooth Device to Send and Receive Files
Now that your device is connected to your PC you can start using the wireless connection you’ve now set up. Mostly, this should be automatic. If you’ve connected a pair of Bluetooth headphones, for example, Windows should recognize them immediately as a playback device.
If you’ve connected a phone or a device that has the ability to send and receive files, you can launch the Bluetooth File Transfer function from the Bluetooth settings page. Scroll down and click the “Send or receive files via Bluetooth” link.

Enable Bluetooth Windows 8
In the Bluetooth File Transfer window, select whether you want to send or receive files and then follow the prompts.
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