an hr before my pendrive was ok and this all started when i used it for some time in my friends pc. the pendrive is showing write protected.. not able to format.. Tried everything... but not able to delete anything from the pendrive A scan with AVG 7 showed the presence of "Trojon Horse BackDoor.Generic3.SDV" but the antivirus was unable to vault or delete it.. what should i do now????? help!!!