In addition to what you have done, do you have an advanced utility like DiskWarrior or TechTools. These can literally clear crap up and get your system running trouble free.
Also, have you created a new account strictly as a troubleshoot account? This way you might narrow down the possible...
I have successfully burned a DVD-RW and I now want to copy some of these files back into my hard drive but there is a problem.
I can copy most files from the DVD-RW but when I move to copy certain files, the Finder (or Pathfinder) does not copy the file and locks up my system in which I have...