I don't know if this will work, but you can download TrueCrypt

http://www.truecrypt.org/

Normally you'd create either a file container or encrypt an entire drive which TrueCrypt mounts in Windows to one of the drive letters. You could just create a bunch of small containers and mount them all to create a series of drives on your PC.

They disappear once you restart and you have to remount them for them to re-appear as drives. Don't know if this would help you