10. Disconnect From the Network
Some legacy hardware such as scientific equipment may work only with Windows XP due to the lack of more up-to-date drivers.
If you only need Windows XP in order to use this type of hardware and acquire data from it, consider disconnecting the computer from your corporate network (and the Internet) if it's possible to transfer the acquired data to other computers manually (by using a USB stick, for example).
At the very least, you should use network segmentation to isolate Windows XP machines from more sensitive parts of your network.