Step 1: Get all the essentials.

You'll need The Wiinstrument for Windows, the Microsoft Visual C++ 2005 Redistributable, the Bluesoleil Stack (you need version 5 for Windows Vista, but version 4 should work for XP as well), a compatible bluetooth device and a Wiimote + Nunchuk ;)

Step 2: Installation.

Connect your bluetooth dongle to a USB port and ignore the Windows driver setup screen.
Install the Bluesoleil software and the Microsoft Visual C++ 2005 Redistributable. Just follow the on-screen instructions.
Then, unzip The Wiinstrument to a folder of your choice.

Step 3: Connecting your Wiimote.

Right click the bluetooth icon in your task bar. From the pop-up menu choose "Turn on Bluetooth".

There should be a "Bluetooth Places" icon on your desktop. Click it.

Before we can connect the Wiimote, we need to discover and add it to our bluetooth places. This needs to be done once for all Wiimotes you are planning to use. Just click the "Search Devices" icon. A flashlight will indicate that the software is searching for bluetooth devices.

Now press buttons "1" and "2" on your Wiimote. This will bring the Wiimote into discovery mode, so that the bluetooth software can find it. After a few moments, a configuration dialog should appear. Follow the instructions and complete the configuration. A new bluetooth device, called "Nintendo RVL-CNT-01", should be on your bluetooth places now. If you have problems getting your Wiimote connected, try pressing "1" and "2" on your 'mote first and then click on the "Search Devices" icon.

Right click on the icon and choose "Connect".

A window should pop up, stating that the software is trying to connect to the Wiimote. Again press "1" and "2" at your Wiimote.

If the connection attempt was successful, the blue parts of the "Nintendo RVL-CNT-01" and the "My Device" icon should turn green and the Wiimote's LEDs keep flashing.

That's it! You can now start the Wiinstrument executable and start drumming ;)
Tobias from screenfashion.org