My 900b unit is freezing up after about 5 or 6 touches on the touch screen. When I go into the Win CE mode it does the same. I can turn the key off for about 30 minutes go back into Win CE mode an it will let me copy for 5 to touches then more or less locks up. Could I have a virus in the OS? I've cleared the flash drive and reloaded the backup several times and even put the backup from another gsxr 1k on the flash drive with the same results. Is there a way to reformat the flash drive or replace the OS. Has anyone tried to use norton antivirus or any antivirus on one of these systems. Any help welcomed!!