It maybe some problems have been going on for a while with your system!Lets run though some basic repair checks .Repair Mac HD , Check Permissions with the OSX Startup volume.To check for disk errors and possibly fix issues with the Mac HD volume and other Partitions .Please run a Mac HD drive repair ,and Repair Permissions of the Mac HD startup volume .Disk Utility1 Start from your Mac OS X Install disc: Insert the installation disc, then restart the computer while holding the C key.2 When your computer finishes starting up from the disc, choose Disk Utility from the Installer menu.(In Mac OS X 10.4 or later, you must select your language first.)?Important:- Do not click Continue in the first screen of the Installer.If you do, you must restart from the disc again to access Disk Utility.3 Click the First Aid tab.4 Click the disclosure triangle to the left of the hard drive icon to display the names of your hard disk volumes and partitions.5 Choose your Mac OS X volume.6 Click Repair. Disk Utility checks and repairs the disk.If errors are found please run the check twice .Report any errors in displayed RED to me .Tip:- Always start up your computer from an Install or Restore disc when using Disk Utility to verify or repair your startup volume.**Perform Disk permission repairs while Booted to your Mac HD as normal**.Using the Repair Privileges UtilityFor Mac OS X 10.2 or later, open Disk Utility found in the Applications/Utilities folder.Select your Mac OS X startup volume in the column on the left of the Disk Utility window, then click the First Aid tab.Click the Repair Disk Permissions button.Please wait while the Mac HD is checked.If errors are found please run the check twice .Report any errors displayed in RED to me .-Permissions DefinedMac OS X incorporates a subsystem based on a UNIX-style operating system that uses permissions in the file system.Every file and folder on your hard disk has an associated set of permissions that determines who can read, write to, or execute it.-Also its best to get a full disk repair tool for future use :-Drive genius may have prevent this problem as it seems your Mac HD had an error that needed to be fixed , Apple disk utilities is a basic application not intended for major disk error repairs or testing :-http://www.prosofteng.com/products/drive_genius.php?PHPSESSID=d0291636841b25cf082e211e2d6def53- If there's still no difference with your issue , please let me know .Please provide all details of the remaining problem if any after the repairs are carried out to the Mac HD OSX installation , including what applications are affected .Please let me know if you need any extra info regarding the above?I will give full instructions to do so if necessary.I hope this helps .