The MBR (Master Boot Record) has an invalid partition boot entry so the operating system can not be launched. This issue occurs prior to the start of any Windows code. It can be caused by a power-failure while the disk is in the middle of writing, a virus damaged the entry or a serious software bug damaged the partition entry (although Windows typically protects against this). This issue cannot be easily caused by any action you performed, unless you turned off the power without going through Windows shutdown.Although not stated in the message, press Ctrl-Alt-Del to reboot.
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