Unable to delete autorun.inf on flash drive

Hello,

my flash drive has a autorun.inf file which is 2kB in size. also there is a hidden folder named "makier" that contains a file called "kiddyp.exe". I scanned the pen drive for viruses but the anti virus did not detect any. I also tired to remove autorun file by deleting from command line but i got back an error stating that the file was being used by a system program. I was returned with the same error when i tried to format the drive. Please help.