I ran the bitcoin client for a couple of days in January 2010.
I am using Recuva to try and recover Wallet.dat.

Does this filename ring any bells?

INFO "Filename: 49C7D454d01 Path: D:\?
Size: 30.6 KB (31,348)
State: Very poor
Creation time: 1/31/2010 19:59
Last modification time: 1/31/2010 19:59
Last access time: 1/31/2010 19:59
Comment: This file is overwritten with "D:\Programas\Mozilla Firefox\chrome\pippki.jar.moz-backup"
6 file cluster(s) overwritten (0, 1, 2, 3, 4, 5)
4 cluster(s) allocated at offset 6301398 4 cluster(s) allocated at offset 6305132"

Cheers