First you need to scan your pen drive completely by using best antivirus program and remove all bugs if antivirus application found.
In case after scanning data inaccessible problem still present then you need to run MS DOS command for removing unwanted files from the pen drive.
Open DOS command shell on your computer
Run this following command “dir/w/o/p” then press enter
This command showing you all presented files and folders list
Now need to check this following files name
If you find out any unprotected files then you need to delete it through this command
del new folder.exe
Once you done this process now again insert pen drive and check your data. If still this problem doesn’t solve then you need to take help any external solution like Kingston pen drive recovery software. You can get complete information about this application from this website:
message edited by walkerjohnnie