Most computers will boot from a CD-ROM now, so you should
be able to just toss in the XP CD, shut down your system,
reboot, and choose "Boot from CD-ROM." If it will not
boot from the CD, check your boot options in your BIOS and
make sure that it is set to boot from the CD-ROM, then try
it again.
If this still does not work, create a boot floppy (Put a
blank floppy in your A: drive, go to My Computer, Right-
click on the A: drive, select "Format," check the box
for "Create an MS-DOS stratup disk," and then hit OK.
*this will erase anything on that floppy*
Use this to boot the system, and it should let you access
the CD. Again, your BIOS must be set to boot from the
floppy drive. If you have a really nice BIOS, it will let
you assign a boot order to all of your drives.
If all else fails, just toss in the CD while XP is
running. You can install XP on top of itself, which
basically refreshes the system files. This method will
preserve you documents, installed progs, etc, but is not
as clean as doing a fresh install from DOS.
Anyway, the formatting proceedure is pretty straight-
forward once you start the install process. Just choose
NTFS on a single partition and a normal format (as opposed
to the quick), and it's pretty much on autopilot after
that.
As for backing things up, all you have to back up is stuff
that you don't want to lose.
