macbook pro-very slow :(
Hi, i purchased my macbook pro in january of this year. Its my first mac so i dont really know the ins and outs of it. I only really use it for college work, excel, powerpoint etc. I dont really download anything and i use it for normal web surfing eg facebook. For the past 5 days my macs been acting really slow. Slow to start up, sometimes wont open the dock at the bottom and takes forever to do just simple tasks..like opening the activity monitor took 15 mins!! its driving me crazy. Please help
MacBook Pro, Mac OS X (10.7.2)