Whenever formatting my USB Data Traveler (Kingston 2GB DT 172GB ) (CN 051008 5V), my window always show me " Windows was unable to complete the format. " and whenever i put it in my USB Port, it always show "You Need To Format" What should i do ...

Click start control panel administrive tools computer management disk management right click on your drive select properties click tools you should see click check now click start two boxes automatically fix files and scan for and attempt recovery of bad sectors place then a tick in both boxes then select check now start or you might tick one box then return after its finished the first repair then return and tick the second box you should not do anything while the chkdsk utility is in progress any input may damage this drive if you still want or need to format
click start click on my computer you should see your drive
right click then select format
another way is to control panel administrive tools computer management disk management right click on your drive select format
hope this helps"