So my dad is trying to open up Quickbooks 2007. And just recently everytime he tries to open it he gets the "Windows is preparing to install..." box. If he cancels it just locks up the computer and if he leaves it open it gives a bunch of error messages. I've seen this window before and i have no idea what exactly causes it. Any input please? He can't reinstall because he cant backup his data because he can't open quickbooks. Unless there is a manual way to back it up, i'm not sure because i dont really use that program.