I Faced the same problem with my external harddrive.
After going to numerous post on net could not find a solution. Then tried some work around myself and got solution to viewing your files and recovering them.
A very simple and straight forward ways.
For this you need to have winrar installed.
click up sign next to address bar
keep clicking the sign till you reach My computer and all drives are visible below.
Then click on the hard drive where you face this problem.
you would see folders and files all related to system.
you need to click on the first item in the list with Hard drive icon.
all you content would be there.
you can then create arches of the files on your PC.
And then extract the files from the archives.
To show your hidden files: http://windows.microsoft.com/en-GB/windows-vista/Show-h...
Doesn’t make a sense?
Is your drive attacked by virus?
Run anti-virus scan and clean the virus.
If it is not attacked by virus, you may get a corrupted drive.
To access your folders, you should try to restore your inaccessible files for free at first and then format this drive to take a chance. (Don’t worry! This freeware has ever completely restored the business files from a RAW hard drive. I trusted it can help you, too.) Important note: You are supposed to keep at least two copies of everything important on separate drives all the time in case of similar problems.