There is weird problem with my pen drive.Its a PNY 4gb flash drive that i bought about a week ago.the problem seems to be due to 4 malicious objects one being a .cmd file.I have tried unlocker and other updated anti viruses.They apparently detected the viruses but were unable to delete them.I tried formating using command prompt but it was unable to format the drive.the most frustrating part is i can copy the contents,view them yet cant delete them.whenever i try to delete them they disappears and again reappears from no where.pleaseeeeeeee helpppppppppp.................