Please help!!! my sister laptop automatically loq as guest account. therefore she cannot format, install even running antivirus also restricted. Try to switch account by pressing windows key + L. but after in switching mode, there is no administrator account. seems that it get virus or something wrong. then i have a good idea, just format the hdd, but it can't be format because it is guest account. anyone helpppppp!!!! is there away to reset the laptop to its original state.!!!! is this somekind of virus??