Hi, sorry to hear that you cannot access your files, it is possible that some of your files are corrupted, with the help of a data recovery program you should be able to recover most of your files, using Google you can find several options. To verify if the hard drive has any hardware problems you can also run a test with DLG.
How to test a drive for problems using Data Lifeguard Diagnostics for Windows
Also check if the following link helps.
