How can I fix my HP G62?

I have a problem when I try to start up my computer it goes to "windows failed to start...." I have two options but both take me to the same place "the boot selection failed because a required device is inccessible" I tried hitting F8 and took the advice of people on the Internet but nothing... show more I have a problem when I try to start up my computer it goes to "windows failed to start...."
I have two options but both take me to the same place "the boot selection failed because a required device is inccessible"
I tried hitting F8 and took the advice of people on the Internet but nothing has worked. Safe mode doesn't work and it says the status is 0xc000000f.
I don't have a windows disk because it is a laptop and didn't come with it.
I need some major help now! I will vote best answer for the one that helps me.
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