the annoyin flashin FILE button-beside the edit,view,favourites,tools,help buttons

im using my daughters lap top n she saves her email n password so that she doesnt have to type it in so therefore she doesnt have the issues im havin since i dont save either..everytime i try n put my email or password the little file button will start flashin non stop on its own n at the same time where i sign in the topics saying...UNDO, COPY, PASTE, DELETE ETC..WELL THAT BOX APPEARS N IS FLASHIN ALSO RIGHT WHERE I HAVE 2 SIGN IN THEREFORE PREVENTIN ME TO BE ABLE TO SIGN IN AT ALL...ITS LIKE THERES A GLITCH IN THE PROGRAM BUT NO ERROR MSG POPS UP..itried to repair windows live messenger then restart the comp n it didnt work it actually got worse cause now that file buttom starts flashin when i try sendin an offline message n the box with the mentioned topics i said earlier will pop on where im tryin to send my offline message n continues to flash non stop..maybe i should runinstall windows live n put back in again?..this is sooo weird n it only does this on her comp....so can anyone help?