What do you mean? Windows 7 has native drivers for many bluetooth adapters. Mine loaded up in about 10 seconds. No driver hunting required.
Going by the type of questions I've come across recently on this and other forums, I get the impression they think if they have a bluetooth device it connects to the computer all by itself without the need of a receiver, other then the driver.
The makers of these devices are partly to blame as they don't make it clear that a dongle is needed.
Here is an example from Nokia:
"The Get Connected wizard helps you to connect your mobile phone to a PC. After you have completed the wizard steps, you have established a connection between your phone and the PC, and can start using Nokia PC Suite applications.
The Get Connected wizard consists of the following steps:
Select which connection type to use when connecting the phone to the PC. This can be cable, infrared or Bluetooth wireless technology.
Establish and configure the connection"
As you can see no mention that a Bluetooth dongle is needed at the PC end.