Follow the on-screen instructions and install the drivers. This will open the installing window of the Apple Wireless Mouse drivers.Right-click on the AppleWirelessMouse64 file and select Run as administrator.In the Apple folder, look for the file by the name AppleWirelessMouse64.Once extracted, go to BootCamp > Drivers > Apple.Once the Boot Camp zip file is downloaded, extract it.
This will start your PC to search for available nearby bluetooth devices. On the Add a device window, click on Bluetooth.Make sure the Bluetooth is turned on and then click on Add Device right next to the Devices option.Go to Bluetooth & devices from the left.Press Win + I on the keyboard to open the Windows Settings.Here is how you can add and set up the Magic Mouse on Windows via Bluetooth. It is a pretty straightforward and simple procedure just like connecting any other Bluetooth mouse. The Magic Mouse also uses Bluetooth connectivity in order to get connected as an input device and hence connecting to the Windows PC is no big deal.
Try Magic Mouse Utilities How to add and setup Apple Magic Mouse on Windows