Hi blossom83,
your blue screen is probably more due to driver error than virus activity.
Try booting into 'safe-mode' (press F8 when booting) and if you actually get the machine to boot up then it's probably a driver error. You can either find the latest drivers or did your machine come with a set-up disk or a reset disk? If not please list what machine you have trying to give as much information as possible.