I had this USB OF 512mb. All of a sudden when I view and format the usb it only gives the maximum capacity of 2mb. I had reformat this usb but it still indicates that it had all free space with still only 2mb of maximum capacity. Even I scanned with antivirus, but still no change.
Please need help ASAP

I have 512MB USB too, but I have not seen this. Try to Format it to FAT32. If you don`t know how: Go to "My Cmputer" right click on Flash drive and then chose "Format" . I hope it will work.