Portable Apps Error

I uninstalled the U3 drivers that came standard on my 16 Gig U3 drive. After installing portable apps and some of the apps i wanted, i removed it from my computer. Later when i put the drive back into my computer it was wiped clean, I cant access the Drive at all every time i try to open the drive windows tells me that it needs to be formated. When i try to format it, it eather just sits there and does nothing or it gets an error message.