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Are you able to enter its BIOS mode?
If so, just simply reset the BIOS to all default settings then reboot.
If in any case the Windows can't restart, press F8 or Shift-F8 to enter Windows Safe mode.
> the laptop I have the problem with is not connected to the internet
You mean your Windows can start now? Just can't access the Internet over Wi-Fi?
> so I don't think remote assist would work
I guess you mean the $39 remote assistance ad on your screen? Just ignore it though it is annoying.