I recently installed Windows 7 Ultimate 32 bit onto a Dell Latitude XT that had Windows Vista before. During the driver installation I noticed that the mouse cursor had acquired a bug, it jitters at rest after a restart and won't respond to the mouse commands until the password is entered. It also does the same thing when a dialog box opens needing a response to a permissions approval and I have to use the arrows to make my selection yes or no before it will move and then stop jittering. Any Suggestions as to a resolution to this problem?