No offense, but it's common knowledge that recent Microsoft operating
systems require "online" activation of some sort. You should have asked
about this.

Have someone with 'net access or near a telephone contact Microsoft and ask
what you should do. Microsoft should be able to supply some form of
confirmation that will allow the computer to continue working.

Note that activation is "permaent" unless you make sufficient system
alteration (peripherals, lots of software) that the OS starts thinking it's
on another computer. (Yeah, I know that sounds dumb.