ERROR MESSAGE:cannot remove folder,the file or directory is corrupted and unreadable

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.

 

Although some drive manufactures and BIOS provided so-called "low level format utilities", they actually perform a write-read verify of the drive's user data sectors, and do not actually perform a low-level format. SimpleTech does not provide such utility. In the event of a corrupted master boot record or boot block virus, use FDISK /MBR command to restore the master boot record. But be careful not to do it to your hard drive.

 

thanks for your advice.can you explain more in detail please.What can i do with my external G: drive?