Will reinstalling from setup disk delete my data files?

I can't do a thing with my MacBook. The cursor drags phantom selections, the track pad won't work properly and it takes ages for typed words to display. I have lost my applications in Finder and the disk utility is telling me there is a bad file. I've deleted the cache and done the PRAM thing to no avail. It is fully charged. If I reinstall the original disk, will I lose my data files and pictures, etc.?
Elaine

Hi, Elaine.
Go to Disk Utility (Applications > Utilities > Disk Utility) and check on the S.M.A.R.T. status of your hard disk. Also, while there, select the named boot volume in the left sidebar, ("Macintosh HD" unless you've renamed it). What is the hard drive capacity? Please let us know how much space remains available on it. Repair permissions on it.
There is a way to reinstall without losing your files, but it may not help if your drive is failing, so we need to determine its condition before proceeding.

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Sorry if my use of jargon/process is not that clear.
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Will reinstalling from setup disk delete my data files?

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