I recently downloaded from Comodo their disk encryption software and started encrypting my "c" drive, but didn't know it would take at least 2-3 hours to encrypt and I started at 11:30 at night.
I set the password and the algorithm and got about 10 minutes into it. It was going good but I didn't want to wait for 2 or 3 hours so I canceled it and finished my other stuff and turned it off.
The next day I started it and asked for password right away and would not let me type it in.
(I have windows xp sp3 32 bit)