Q: No bootable device

Your signature says 2011 MBP. Is that correct? If yes, 2011 MBPs need a physical DVD in the built-in (not external) Optical drive to install Windows. You cannot install W10 on 2011 MBPs directly.

1. Download W7 or W8.1 from https://www.microsoft.com/en-us/software-download/home .

2. Burn the ISO to a physical DVD. A DVD-R SL media burnt at the lowest rate and verified is the most reliable method. If you have a commercial DVD from Microsoft, even better.

3. Use https://help.apple.com/bootcamp/mac/5.0/help/ as a reference. Ignore the ISO part because you need to use the DVD. By default, you should have only two options, Download and Install. If you have modified Bootcamp Info.plist, restore the original version.

4. Insert the DVD and click on Install and follow prompts.

5. Install BC drivers from the Download option using a USB2 flash drive you downloaded.

Please also see Install Windows 7 and earlier on your Mac using Boot Camp - Apple Support .

If you run into any issues, or have questions, please post back.

When installing windows 7 the process kept restarting when i finished and kept asking to enter my product key so I took out the USB which I believe has the support software needed to fix this but how am I able to fix the problem of the installation not completing and restarting?

The Support Software and Product Key are unrelated. Do you have your W7 Product Key that is printed on the media (DVD or KeyCard)? You need to use that to activate Windows.

Does Windows recognize the USB, if you connect it to your Mac? If yes, run setup.exe from the Bootcamp folder on the USB which should provide the proper drivers. I assume you have followed step 11 in Install Windows 7 and earlier on your Mac using Boot Camp - Apple Support .

Please remember to backup OS X, Windows (preferably to two separate physical disks) and create a Windows System restore point.