Bootcamp trouble and iMac will not read DVD-R with Windows

Hi,
I have a late 2011(or maybe early 2012) imac that came with OS X Lion but it's been upgraded to Mountain Lion.. I'd like to bootcamp it and install Windows 8.
I've been trying this for a long time now and then i discovered my imac was not bootable with a usb drive.. Bootcamp restarts and then there is a black which says 'bootable disk not found. insert and press any button' (something like that)... So... i dicided to try with a burned windows 8 dvd-r but when i burn an image to it in disk utility, it says 'medium write error' and the disk pops out... I already have all the windows drivers downloaded.... This is supposed to be a problem with the operating system... As you guys can see, i am having a lot of problems..
Any solutions?
Thanks in advance!

I tried using Finder to open files but as they are greyed out this would not work.
That sounds very strange - like it's a disk format issue.
What is the disk format of the Sony DVD+R you are using? (Do a 'Get Info' when the disc is mounted on your Desktop.)

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