A friend of mine insisted on formating my usb (kingston 8 gb) memory which was OK. He used a program called something like `bionce`. There were options like FAT 32 and so on. I suppose he filled in a wrong one. Now it does not work and cannot be formated .
With the drive plugged in, try Control Panel > Administrative Tools > Computer Management > Storage > Disk Management. Toward the bottom of the screen there should be a stripe somewhere for your flash drive. Right click on that stripe and go to Format. Make sure you pick NTFS and check "quick format."
Obligatory Warning: MAKE SURE YOU USE THE STRIPE FOR YOUR FLASH DRIVE. IF YOU DO THIS ON THE WRONG DRIVE YOU WILL ERASE ALL OF YOUR DATA ON THAT DRIVE.