Boot Camp partition not showing in startup disk or when holding alt key

I've read countless discussions about similar questions to this one, however, I still haven't been able to find any solution.

I have an old 2006 MacBook that has just been fully updated and reformatted. I'm running OSX 10.7.5 and Boot Camp 4.

I went through the Boot Camp installation from an Windows ISO image in my usb drive, where it succesfully downloaded all files needed, and prompted me to make the partition, after which it restarted and was supposed to take me to the installation manager in the Windows partition. I first got the "No bootable driver" error, to which I read I was supposed to restart the computer, hold the alt key, and choose the boot camp partition. However, it does not show up. I only get Mac and Recover drivers.

I went into the Mac's startup disk, and only the Mac driver is showing, no Boot Camp driver, however, when I go into Disk Utilities, I can see that the BootCamp driver there.

I read somewhere that I should zap pram and reset SMC, which I did with their instructions. It didn't change anything, I still only get the Mac driver and Recovery when hitting the alt key.

Does it have something to do with my MacBook being older? That's the only reason I can think that would not allow me to do this.

Let me know what other info I can give you so that you can please help me!! Thanks in advance!