apple airpods max won't pair

Hello MarkHandley,

Welcome to Apple Support Communities. 

We understand that you’re unable to pair your AirPods Max to your Windows computer. We are happy to help.

These steps may help. Please try the steps here: Set up AirPods Max with your Mac and other Bluetooth devices - Apple Support

"Use AirPods Max with a non-Apple device

You can use AirPods Max as a Bluetooth headset with a non-Apple device. You can't use Siri, but you can listen and talk, and use Active Noise Cancellation and Transparency mode. To set up your AirPods Max with an Android phone or other non-Apple device,1 follow these steps:

1. On your non-Apple device, go to the settings for Bluetooth and make sure that Bluetooth is on.2 If you have an Android device, go to Settings > Connections > Bluetooth.
2. Press and hold the noise control button on your AirPods Max until the status light flashes white.
3. When your AirPods Max appear in the list of Bluetooth devices, select them."

We also recommend checking for any wireless interference using the steps here: Resolve Wi-Fi and Bluetooth issues caused by wireless interference - Apple Support

"How to reduce wireless interference

These general steps can help achieve a cleaner, stronger wireless signal:

• Bring your Wi-Fi device closer to your Wi-Fi router. Bring the Bluetooth devices that are connecting to each other closer together. 
• Avoid using your wireless devices near common sources of interference, such as power cables, microwave ovens, fluorescent lights, wireless video cameras, and cordless phones.
• Reduce the number of active devices that use the same wireless frequency band. Both Bluetooth and Wi-Fi devices use the 2.4 GHz band, but many Wi-Fi devices can use the 5 GHz band instead. If your Wi-Fi router supports both bands, it might help to connect more of your Wi-Fi devices to the 5GHz band. Some dual-band routers manage this for you automatically.
• Configure your Wi-Fi router to use a different Wi-Fi channel, or have it scan for the channel with the least interference. Most routers perform this scan automatically on startup or when reset."

Let us know if you have further questions.

Take care.