Iball 8 gb pendrive format my pen drive on windows computer

when inserted pen drive in to USB port a question appeared that your device needs to be scan do u wish i clicked yes further the pen drive scanned by computer thereafter question arises that your device needs to be formatted before u use it i clicked format and after that it appeared your device could not be formatted by windows and all files are vanished each time the same is happening now please tale how can i format my pen drive on windows computer