Hello folks. I use a USB SATA hard drive to make backups on.

So..Got a laptop in that was having issues, maybe virus?. Customer OKed us to make a backup of their data and format and reinstall windows. Copied their files onto the above hard drive. No problems. Formatted, reinstalled Windows. Plug in the above drive to copy data back on, and the drive is bugging out. Give this message drive "is not accessible. The file or directory is corrupted and unreadable."

I really need the data off this drive. What steps should I take?

Thank you.