Messages sent from or received on your device cannot be viewed in any other medium. You can, however, forward text messages to an email address, and then view/print them just like any other email.
Here is a link for further text messaging http://support.vzw.com/clc/faqs/TXT%20messaging/faq.html
You can try this app. I'm not sure if it will allow you to be able to read them on a computer or not, but it's worth a shot, and free. I would think, since it saves them to the SD card, that there would be some way of accessing them once they are backed up.