Unable to Log into FileVault user account.
I'm randomly getting the error "unable to log into FileValult user account" after I enter my password. I was trying to free up some disk space, and every since I've been getting that error. I've done some research and can find others with the same issue, but cannot recreate any of the other solutions. I only have one account set up and do not have the master password since I purchased my computer used. I can get to the root menu and have the installation disks. Ran Repair permissions. Any help would be appreciated!
MacBook, Mac OS X (10.4.8)