If I were you I'd keep it the F away from best buy. Any serious computer technician/IT Guy will tell you Geek Squad is an absolute sham. (google "geek squad sucks" for some horror stories on this). In short, they are not a service organization, but a sales organization, so expect to be upsold and not given great service.

ANYWAY. Does the drive still reliably boot up? If so, before it dies you might be able to image the disk to a new hard drive using a tool such as Norton Ghost or G4L (http://sourceforge.net/projects/g4l - this is freeware). This might or might not be beyond your comfort level, but just floating the option.