First, Welcome to Windows 7 forums!
Second, usually one of the first things to try when a drive is acting weird is to uninstall and reinstall the device to repair a corrupt driver
if that's the cause. You can do this in Device Mgr, or physically unplug the drive and reboot, then shut down and replug it, start up and let windows re-detect the drive and reinstall it.
If you use Dev Mgr you also need to reboot between all actions so the system knows it's been uninstalled and will reinstall it.