How do I reinstall OS?

HOow do i reinstall the operating system on my HP G42, it also says bootmgr is missing....... any g

  • disk

    Votes: 1 100.0%
  • flash drive

    Votes: 0 0.0%

  • Total voters
    1
  • Poll closed .
Hello,, im not computer savvy but I kno enough to do my basic gaming& email

I would like it if someone could me how to a hard reset
 
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