My HP laptop has done the same thing since I got it. went thru the filter delete and everything else and like yours it cycle...IE6 is vulnerable...IE7..saved me from IE8 whIch frankly was like watching grass grow if it loaded at all and now the 7 is doing the same thing... won't load.. slow as crap.... Solution? MICROSOFT FIX YOUR CRAP! and stop loading up my computer with your updates just make the sh_t right to begin with since you have all that money MAC! which has no registry and comes on imediately when fired up.
I found that if you simply restart your computer right after reinstalling all components of i tunes the optical drive and I tunes work perfectly including burning cd's and everything else for good. Just make sure when you uninstall I tunes you uninstall everything including quick time, bonjour, apple update and support, and anything having to do with apple and or I tunes. This works even if you have deleted your upper and lower filters.