Well since you already know the answer to your problem ( buying from places described in this article among many, many others:
http://www.hoax-slayer.com/cheap-software-spam.html ) and they are not standing behind their promises I really don't know what anyone can do to help I am sorry to say.
iLife has a very straight-forward installation process and at least if you got a bad disk (which of course can happen) from a legitimate distributor you could call them and get a replacement. Guess in this case you will have to wind up writing the cost off to a lesson learned- but it is a major pisser that they wind up keeping your money!
Now understand I am not piling on about this because I really do feel bad that people get ripped off by these clowns that have the nerve to say it is legal software, but after reading some of the stuff on their site, I just wonder what would lead a person to think that this was legitimate with answers in their FAQs like the section quoted below, or it is just the draw of saving money so people pretend (or wish) it is legit? I mean come on- Adobe CS3 Design Premium Edition which retails for $1800 selling for $174.00 with no packaging (as they mention in their FAQ section too) and a keygen produced registration code? Anyway again I am sorry this happened to you!
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Should I call the Manufacturer if I'm having problems or you?
Please do not contact the manufacturer for install issues, we provide the support for all install problems. Also if you need to register the software do it thru the program itself after it is installed,
do not register thru the internet or phone as the product you just purchased is OEM and must be registered thru the software. If you have any other problems, let us know and if we feel it nesessary we will refer you to the manufacturer, since we sold you the software, we are your source of contact-not the manufacturer, Thanks!!"