No i havent Dl'd anything like that cause i do not trust them. I assume that mac own security is already good right? I rarely DL things from sources i do not trust. Could downloading certain types of files have to do with anything?The Erase Free Space will overwrite where files have been removed and not generate new space. There are problems where doing this creates a file which takes up all the free space showing the hard drive as full and it is then necessary to remove that file. This shoiws how:-
http://www.mac-forums.com/forums/os...8-erase-free-space-function-disk-utility.html
A hard drive requires a minimum of some 15% to work anywhere near efficiently and if that is not the problem, any chance you have inadvertently downloaded malware called MacProtector, MacDefender, MacSecurity and similar names, and are you by chan ce running antivirus software which can bloat and slow your iMac?
This has been going on for a couple months on and off maybe longer cause in this time frame i noticed its interfering with very important projects.