I just bought an hp pavilion 500-277cb. Got it mostly to use lightroom. Well my free Mcafee trial went out. Was out of town when it happened and when I got home everything has been messed up. Internet explorer is barely working, it is so slow. Tried to download firefox but it will not let me download anything. Also it will not let me open Lightroom now. Can anyone please help me figure out what to do. Not to good at this technical stuff.