Hello I am having problems with my macbook pro which i bought about 2 years ago. The first time since I have this computer. Sometimes it freezes, including the mouse then I need to push the power switch and reset it. Also sometimes when I type words it doesnt register (the letters do not come up). I dont know what to do but I am thinking that I should reinstall the Leapord. Can I do that without loosing programs? Also is it maybe a hardware problem such as the keyboard itself? Thanks in advance!