I plan on taking the following course of action (in order). Of course, if the problem has stopped at any point, I will just gladly stop trouble shooting:
(1) burn all unnecessary data (movies, etc) to discs, then delete them from the drive
(2) defragment my hard drive with Fix-It Utilities (good stuff)
(3) Try my data recovery on PC (go back to an earlier date before I installed Visual Studio)