Windows 8 & 8.1 - Adding, Connecting & Disconnecting Bluetooth Audio Devices
Many experience issues with pairing their Bluetooth devices after updating or using Windows 8/8.1. There are several resources on the web addressing this issue.
Here are a couple of general links to assist you in troubleshooting your Windows 8/8.1 Bluetooth issue:
It is also recommended that you contact your PC manufacturer or Microsoft support.