Create a dummy user account and provide the login details from that. Your actual account could have a random login name not recognisable as belonging to you. BUT then again it would be pretty easy to suss out there was another/other accounts on the machine.
For those with an interest in primes there is already a distributed project working on finding larger and larger (mersenne) primes. Google GIMPS . They have already got up to round about 9800000 digits long as of sep 11 2006 and are heading for the EFF prize of I think $100,000 for finding a 10 mill digit prime.
I did a bit of number theory during my maths degree and found it very interesting but that was a while ago - one of my Professors specialised in it and that is the level of guy you really need if you are going to find any better way to compute this thing - otherwise you really need more distributed computers than hak5 could possibly get on to this task.
Show them Hak5 with darren breaking his finger - that should grab their attention, it certainly grabbed mne. OUCH! No seriusly rewatch the hak5 shows , plenty of demos there. Watch the vids at www.irongeek.com etc
For starters I'd say head over to the hak5 wiki and irongeeks site. Presentations can be so dry so I would try to include something where you can do a demo.
Again this is using a bootable cd but at least its a win environment. Anyways basically you run truecrypt under BartPE .
Also I'm thinking the sony microvault encrypts/decrypts on the fly with no device drivers needed - just either fingerprint or password input?
Really am loving xampp - W/Lamp in a box - really has let me concentrate on actually learning the php rather than spending time setting up a Lamp server - although that is next on the list!