So. I can't save decks, I'm fairly certain that I saved it under c:/Program Files/redshark/
If you're running Vista, that's the exact opposite of what you want to do.
Uninstall Redshark and then re-install it in a new place you KNOW you can write to.
Because I'm a programmer, I have a "Programs" folder in my username folder (Kayle, in my case), so I installed Redshark to C:/Kayle/Programs/redshark/ and it works just fine for me.
BUT i have vista and mine worked without reinstalling it