Re-establish keys

[eemaestro at gmail.com]

Hi,

I am in the process of reformatting my hard drive (ext3).   I copied
my user files from the hard drive onto backup medium, but I forgot to
copy the .gnupg/ contents.

My public key is on the MIT PGP server.    I know my passphrase.   So
how do I reestablish my keys on the newly reformatted hard drive, in
order to decrypt my files?

Thanks in advance,
Alan