I got my 12' powerbook about 5 months ago, and from the day I started using it, its been as slow as a box of rocks. And all I use it safari, itunes, and occansionally photoshop. So what do I do to get it faster? I dont know crap about computers, all I know is the difference between a powerbook and an ipod. SOOOO what do I buy and how do I install it?