Windows installer won't format partition correctly.

I'm not very tech minded so Ill try to explain best I can. I am trying to partition mac to install windows.
First step: I use Bootcamp to create the partition, the mac restarts and boots to windows installer. However the product key can't be verified, windows won't help with the issue they say it is valid and its apples problem.
Second step: Im advised by apple support to restart the mac while holding C button, at this point I have the USB drive in and the windows installation disc. The mac boots to windows installer and I enter product key, it accepts the product key. Great that problem is fixed. It now asks me to select the partition I want to install on. I select Bootcamp partition is says the format is GPT partition style. Ok I look for fix on internet it says click the format option for that partition. Warning message saying that it will erase all files on that partition. I click ok and it formats it. The word Bootcamp on the partition is removed. So I select this partition again but windows still says its still in the GPT format even though it has just formatted it. How can I fix this formatting issue ? Also I checked the partiton in disk utility and the format is displayed as NTFS, this is what it should be. However windows just disagrees and keeps telling me its in the GPT format.
Anyone got a fix for this problem formatting problem ?
If not what about a fix for the product key not being verified when doing install through bootcamp, if I can fix that I think bootcamp will sort it all out itself. (Yes I have an internet connection when entering product key before anyone asks)
PLEASE HELP!!!! Apple won't help as they don't deal with windows. Windows say that the problem is with Apple.

Try the following steps:
1. Go to Microsoft website to fix install and Unistall problems. Click "Run now" from Fix it to remove all iTunes & related installer files:
http://support.microsoft.com/mats/Program_Install_and_Uninstall
Be aware that Windows Installer CleanUp Utility will not remove the actual program from your computer. However, it will remove the installation files so that you can start the installation, upgrade, or uninstall over.

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Here is my post in the other community: https://discussions.apple.com/thread/5922375?tstart=0
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I did create a Recovery Disk from inside Windows 7 this weekend following your suggestion. Unfortunately, this has the same problem as the installer.
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Hi
Im running a Mac Book Pro 2.5Ghz Intel Core 2 Duo with Snow Leopard v 10.6.7 with all updates installed, i want to install Windows 7 64 bit using boot camp
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Hi all,
I have a late 2014 Retina Macbook Pro with 1TB SSD and Intel Iris Graphics (no nVidia). It has been updated to Yosemite 10.10.2.
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So this is quite embarrassing. I had already deleted the Windows 7 partition via BCA so to answer your question Loner T, I started BCA again. Unticked create USB installer and download support software and only let it create the Windows 7 partition again. The only difference with last time: I choose 149GB instead of 102GB (thanks to the bloody difficult slider in the BCA).
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sudo gpt -vv -r show /dev/disk0
gpt show: /dev/disk0: mediasize=1000555581440; sectorsize=512; blocks=1954210120
gpt show: /dev/disk0: Suspicious MBR at sector 0
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gpt show: /dev/disk0: Sec GPT at sector 1954210119
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1661924928     1269536      3 GPT part - 426F6F74-0000-11AA-AA11-00306543ECAC
1663194464         672
1663195136   291014656      4 GPT part - EBD0A0A2-B9E5-4433-87C0-68B6B72699C7
1954209792         295
1954210087          32         Sec GPT table
1954210119           1         Sec GPT header
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Disk: /dev/disk0 geometry: 121643/255/63 [1954210120 sectors]
Signature: 0xAA55
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#: id cyl hd sec - cyl hd sec [     start -       size]
1: EE 1023 254 63 - 1023 254 63 [         1 -     409639] <Unknown ID>
2: AC 1023 254 63 - 1023 254 63 [    409640 - 1661515288] <Unknown ID>
3: AB 1023 254 63 - 1023 254 63 [1661924928 -    1269536] Darwin Boot
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Windows installer won't format partition correctly.

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