Replying to Going crazy right now! Computer help please...

i just bought adobe creative suite 3 for my macbook pro, it comes with photoshop, illustrator, dreamweaver, flash, fireworks, the whole package... everything installed fine except photoshop. I downloaded photoshop trial a couple months ago and deleted since then. It is telling me that I can't install because it has "(already been installed)". Ive been on the fone with adobe for the last hour talking to ppl in India who just keep redirecting me to other parts of india to more ppl who dont know the answer. Someone computer savvy please help me! = /