I'd boot my Ubuntu CD (it's LIVE!) and see if I can get in there BEFORE ANY DATA RECOVERY APPS are used.
Link about -> http://www.howtogeek.com/howto/windows-vista/use-ubuntu-live-cd-to-backup-files-from-your-dead-windows-computer/
At the top of this forum is the Lost and Found welcome post where you will find apps for free, free to try and recovery services.
i have a 2TB external hard drive connected to my desktop.A few days ago when i was trying to open a folder on the drive in says "XYZ not accessible.The file or directory is corrupted and unreadable".
Is there a way i can fix the problem with this problem.I'm using windows 7 home premium.