I scanned the pen drive with AVG 7.5 free (recently updated) and it detected Trojan Horse TTI and deleted the folders. As the folders contained important information I retored the files and checked in my desktop at home which having AVAST free protection. It detected Win32:rootkit-gen rtk and similarly revmoved the folders.
Then I took pen drive to Office PC where it is showing all the folders without any problem. But the problem is I am not able to use the information in my pen drive in my laptop or desktopat my home.
Please help the information is really important for me.