What do you mean?
You can simply reinstall the OS (which can correct anything that's incorrect). You can also format the hard drive and do a full reinstall, which will wipe out everything.
In either case, you need the OS installation media (CD-ROM). Depending on the age of your machine, you may be able to boot from that, or you may need a current startup disk, which will allow you to boot from a floppy and access the CD-ROM.
Note that if you want to create a startup disk, you may need the OS media available to create it properly.
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Give 'em a hug one more time. It might be the last.
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