Q: bootcamp problem with hardrive

I'm afraid you did not read the error message stating there was not sufficient room to make a Windows partition. You now have a 640 GB drive formatted MS-DOS. You have wiped out the OS X partition along with everything you had on the disk. You will now have to do the following:

Drive Partition and Format

1. Restart the computer and after the chime hold down the Command and R keys until the Apple logo and progress indicator appear.
2. Select Disk Utility in the Utility Menu and click on the Continue button.
3. After Disk Utility loads select the drive (out-dented entry with the mfgr.'s ID and size) from the side list.
4. Click on the Partition or Erase tab in the Disk Utility toolbar depending upon which is activated. If both are activated, then choose Erase.
5. Use the adjustable Pie chart to set the number of partitions if you want more than one. Otherwise leave at the default of one.
6. In the drop down panel set the partition scheme to GUID. Set the Format type to Mac OS Extended (Journaled.)
7. Click on the Apply button and wait for the Done button to activate. Click on the Done button.
8. Quit Disk Utility and return to the Utility Menu.
9. Select Reinstall OS X from the menu and click on the Continue button.

This will reinstall OS X on the disk. If you now wish to use Boot Camp to create a Windows partition then open the Boot Camp Assistant in the Utilities folder. First, click on the button to read the documentation. When you have learned what to do and how to do it, then you can start your Boot Camp partition creation and install Windows.

Boot Camp Help

How to install Windows using Boot Camp - Apple Support

Boot Camp 5.1- Frequently asked questions about installing Windows 8

Boot Camp- System requirements for Microsoft Windows operating systems

Create an ISO image for Boot Camp from Windows installation media

Use Windows 10 on your Mac with Boot Camp

The most recent version of the Windows support software is one of the following:

Boot Camp Support Software 5.1.5769

Boot Camp Support Software 5.1.5722

1. If you are using a 640GB external USB drive to create a USB Installer, it will fail to install. Use a 8+ GB USB2 flash drive.

2. If you have a source ISO larger than 4+GB, it is a mixed 32-bit/64-bit Windows installer (probably about 15+GB). It is not supported. Please download a specific 64-bit ISO that you need from https://www.microsoft.com/en-us/software-download/home .

3. Please post name of the ISO file you are using.