last thursday i had a norton up date, and updated the computer, it is windows xp. and since then it has played up, cant shut down some times with out turning it off at the mains, and some times no green lights on my tiscali, box, also i have a mircrosoft wireless key board and mouse, and it does not work sometimes now only after i have switched it back on. so i have done a scan my computer and it says every thing is fine. also i am still new to this game. puzzled. does it need to go to my computer shop. ?