I saw a video post about deleting caches in our library and system will make your macbook run faster and save some space. But after I deleted the files in the folder, i cannot open some of my application like photoshop, flash, illustrator or office. And some words in my macbook is missing eg: Empty Trash became pty rash. What should i do? Should i reformat the macbook or is there any way that i can set my system back to the way it was before like windows do without losing my files? If i have to reformat my macbook, how do i do that? Help appreciated.