There might be a software conflict between Bluetooth driver and Add-ins in Microsoft Office. Please try to follow the instruction and stop Add-ins function.
Take Microsoft Word 2010 for an example:
1. Start Word application and select [Files].
2. Click [Option]
3. Click [Add-Ins], select [COM Add-ins] and then click [Go].
4. Uncheck [Send to Bluetooth], and then click OK.