There is a lot to be said for removing that stuff (*anything sensitive*) from your PC- put it on an HD or DVD as above, then copying that backup and storing one off-site (another house, workplace or whatever...)
Computers can be hacked, turned in to "bots" or physically lifted up and removed from your residence (in this last case - no amount of software will keep you safe)
arguably, some hard drive encrytion software would help, but installing and administering that (how fast is this machine again ?
wouldnt be worth it - burn 2 DVDs, store one at your parents(?) house (in sleeves, light hurts them over time) and call it a day.
-John