My Acer Aspire 4820T is also having bluetooth problems. It used to work perfectly fine. I'm not sure what exactly I did that caused it to stop working. But when I installed my blackberry desktop manager, it didn't work with bluetooth.
Now it just doesn't work. My phone can still detect my laptop but the laptop doesn't detect anything... it just keeps searching. I know my phone is discoverable since my other laptop can detect it and pair with it just fine.
I tried reinstalling all the drives but nothing changed.
I noticed that when I right-click the bluetooth icon on the taskbar, "Allow a Device to connect" is the only thing that's not clickable.
I also noticed that when I go to bluetooth file transfer and select Receive Files, it gives me an error which says "Bluetooth Transfer Not Complete. Windows was unable to transfer some files. An invalid argument was supplied. To try again, click the back arrow." (there isn't even a back arrow)