How do you re-install dpkg?

[David Nelson <dnelson@wanadoo.fr>]

Hullo there,

1) How does one re-install dpkg? Can I use dselect (which itself uses
dpkg) or should I use dpgk-deb?

2) If I'm getting "segmentation errors" each time I use dpkg and
apparently only when I use dpkg, is it likely to be due to dpkg being
corrupted in some way or is the format of my entire file system
corrupted?

TIA,
David