Okay so recently a corrupt or missing file caused my macbook to go awol and apple told me to re install installation disk 1. So I did, erased my old volume and now have mac os 10.5.6 installed. The problem is double click seems to have just disappeared. I cant highlight using double click, or open any applications this way, I'm also having difficult with applications such as msn mac that I had used before. Is there anything I can do to correct this? It's really inconvenient and bugging me madly.