You dont currently have permission to access this folder

hello , I have trend micro antivirus ... when I plug my usb it sees all files and folders as viruses and denies access to the files and folder it gives me the error "you dont currently have permission to access this folder" click continue to permanently get access to this folder and when I click continue ... I get another error "you have been denied permission to access this folder to gain access to this folder you will need to use the security tab" and when I click on security tab which is clickable I only see General Sharing Customize ... I cant format the usb because it wont let me I cant delete cant rename cant do anything ... I formatted the usb from safe mode but the virus came back ...
HELP!!! im running windows 7 SP1 32 bit