I haven't tried it, but bluetooth dongles generally require an operating system and drivers to allow them to work with a PC - I can't see the 990's USB interface offering that kind of capability.
I suspect that for wirelessly delivering audio to your system, it may be easiest to use a wireless media client. Slim Device's Squeezebox and soem of the current game consoles are the most prevalent players in that category, but there are some less expensive options that are fairly serviceable. I use a
Roku Labs SoundBridge , and while it isn't as flexible as a SqueezeBox and the firmware support can be a bit spotty at times it
does offer both wired and wireless network connectivity and an optical digital output for not much money.