Hi, I own a late 2011 15" MacBook Pro 2.4 ghz i7 quad core . When I'm watching videos ( whether its YouTube or AOL) it doesn't load fast ( the video only plays for 10-40 seconds then buffers Sometimes my laptop icons and top bar stops responding and I have to wait a minute till it fixes... I try to back up my hardrive but it gets stuck on "getting ready to backup" and it never backs up. I try restarting my Mac, going into guest mode and nothing works!!! But when I go on my old PC desktop it loads just fine! I get avg 40 Mbps download and 20mbps upload... What do I do!?? I'm getting sick of my MacBook Pro!!! I had a problem with my other MacBook Pro and they gave me this new one because they fixed the other one more than 4 times! I to go there AGAIN!!! I'm so fed up with this stupid laptop! EDIT: Also the hardrive doesnt make weird noises and I am using 200GB of 750GB on the macbook pro. Could this possibly be a virus??