Please Help, My MacBook works crazy

New Mac user, I was hoping I'm done with all that "bugs on top of bugs" stuff.... but nope, I guess computer is always a computer, even when the pretty commercials say that it is supposed to be working... oh well.
Anyway away with my rant, and here are my problems:
1. This is the big one, iTunes 7 refused to work right, it kept quitting for no reason just about every 2 minutes. So I deleted I tunes 7.0 and wanted to intall iTunes 6.0.5 ... HOWEVER, my computer refuses to install it. During the installation it automatically selects everything as "Skip" and I can't install anything. How do I unskip it... and first of all what the **** is up with iTunes 7?
2. Quicktime doesn't play sound, now if this was some strange file extension on some strange website... i could understand. BUT i was trying to watch a webstream about the new Nano's right from the Apple website... and quicktime refuses to play the audio. Newest version of quicktime by the way, do I need to downgrade that as well?
3. On top of that when playing audio streams for online radio station, quicktime doesn't recognize it as an infinite stream... what it does is it loads it up and plays it and after 5 minutes or so it replays the 5 minutes it loaded again and again.
Please help

Re-Installing the entire OS is a big step to take tho :(
I hear you.
...and I don't even know if it will work
It will work if you don't have a hardware problem.
is there anyway to backup all my settings/programs/files before i do that?
Yes, and this is something you want to do, problem or no problem. Get a Firewire external HD and clone your whole HD with SuperDuper! (basic use is free). You can then use Migration Assistant to restore all of your apps, files, settings etc. from the external to the new install on your HD. Of course, I would check that files will play before you use Migration Assistant.
I understand you are reluctant to take this step, and I agree that it is a bit of a job, and of course it still might not be necessary. But Migration Assistant makes it completely painless.
Matthew Whiting
Edit: sorry, linked wrong Apple Support article.

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