PGP 8.0 is the first PGP version to fully support Windows XP. It does not work with Windows 95.

PGP Freeware is a single-user product that includes the same core PGP Mail software that can be found in our PGP Personal, Desktop, and Enterprise packages.
PGP Freeware allows you to encrypt files as well as the contents of the clipboard, and also provides the ability to create and manage PGP keys.
More info:

PGP Corporation
hxxp://www.pgp.com/