Windows 8 can anyone tell me

That's very little information to go off of. Can you elaborate more? Are you talking about deleted data?
 
Hi,
how do you know files are missing? Error messages or?

Have you tried system restore and go back to a point before the files were lost?

If you have a windows 8 disk you could change the boot order so the system boots from the disk. Boot from the disk and instead of re-installing click repair. The repair button is on the same page as the install button so you will have to go through the disk as if your actually doing a clean install.
 
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