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Linux.
Or literally any other OS than Windoze.
In 15 minutes? WOW!
You could probably boot a live USB and transfer your presentation to it in that time.
Problem is you need a live USB stick…
Make one right now. Stick it on your keychain. Then you will be prepared to at least boot into Linux on a moment’s notice. Should probably also have a look around and figure out how to show a presentation on there or do whatever you might need to suddenly do there.
Or well just have Linux installed in the first place. Preferably NixOS because you can just roll back to a previous configuration if something goes wrong.
LiveUSB of any distro should be up and running in 2 mins max.