If your HP laptop won't boot Windows 10, there could be several reasons, including a corrupted operating system, a hardware issue, or a problem with the boot order in the BIOS. You can try restarting the laptop and accessing the BIOS to check the boot order. If the laptop still won't boot, you can try a system restore or a Windows 10 reset. If the issue persists, you can boot into safe mode and try to troubleshoot the problem. If none of these steps work, you can contact HP support for additional assistance.