Windows – obtain Windows 7 64-bit drivers for the Apple Wireless Keyboard

Since Dell does not offer 64-bit drivers for the laptop specifically, the best thing to do is to go into device manager and find out exactly what hardware you have, then search the vendor's website.

I've found some for you already:

• Chipset
• Wireless
• Audio

Try resetting your keyboard as explained here and here:

1. Turn off the keyboard; better yet, remove the batteries.
2. Click the Bluetooth icon in the upper toolbar, then select “Set Up Bluetooth Device”. If you don't see this icon on your toolbar, click on your System Preferences in the dock, and then Bluetooth in that menu.
3. Wait for the Bluetooth Set Up Assistance to come up and start searching for devices.
4. Insert the batteries and HOLD the power button. Do NOT let go until step 7.
5. Your keyboard should now appear in the assistant.
6. Select the keyboard from the list and click Continue, while still holding the power button.
7. Once you get the pairing code, let go of the power button and type in the code.

For more information on pairing, see Set up your Apple wireless devices at Apple Support.