Okay, so I got my MacBook last Christmas, and recently it's been starting to act really strange. My computer is sooo slow, and it never was before. I have a 250GB hard drive, with 2GB of ram and right now it says 222.55GB available. I don't have much saved on here, but just opening a couple of windows in Safari is a big problem. The system gets so slow, and choppy and unresponsive, especially when using YouTube. The ram usage goes really high, even though it never did before. I visit porn sites occasionally, and I don't have virus protection. Please help! I just want it to act normal again.