Can't Remove Internet Modem USB Stick In Windows 7?

I am using Internet Modem USB Stick with my computer. My computer is Windows 7 Professional. I have a problem with removing the Internet Modem USB Stick from the computer. When I insert the Internet Modem USB Stick into my computer and then I wish to remove it, I really can't do so. I, however, can remove the Internet Modem USB Stick from the computer easily in Windows XP.I think it will reduce my Internet Modem USB Stick Lifetime and there probably should effect my computer lifetime if I try to remove the USB Stick without allowing to reject.