Hi, I have a mac laptop running OS 10.4 which has been working perfectly until recently. Lately I have tried downloading itunes, Limewire etc and for some reason my installer will not open and install the mpkg files required to run these programs. The installer seems to recognise the file but only bounces once and doesn't launch. Is there anyway I could solve this problem?? Starting to get very frustrating! Any help or advise would be much appreciated! Cheers!