i have been using a 128mb flash USB memory.some files in it are not accessible.when i tried opening or deleting it says "cannot remove folder :the file or directory is corrupted and unreadable".i do have back up copies of those files but i want them removed.i have also noticed a new file in the drive by the name "s2uk".i am not sure if it is a virus or something.i keep removing it and it promptly comes back the next time i open the drive.Please help me.