haven't had my comp long, and have to admit to not being too clued up on the whole thing but recently after adding a few programmes my start up screen (when i turn my comp on) takes ages to go off. the blue screen that say windows starting is on forever and i have to wait til a screensaver comes on til i can sign in. I've tried restoring my comp but it hasn't made any difference. what have i done and how can i fix it? please help.