I have a 6 month old ASUS 1 GB laptop with Intel duocore. Its been getting slower on bootup and in general. I'm getting messages saying OS full. I did a bit of forum research (being not esp pooter-savvy) and after exploring "diskmgmt.msc" find that drive D is almost empty and only has data I imported on it, which I can delete easily. I have disabled some stuff I don't need/use from "services.misc". I'm the only user and I only use it for web surfing, banking, ebay, emails and small stuff, not a gamer. What can I do to optimise the obviously unused drive?