Hello and welcome to LQ.
32 bit on a 64 bit computer isn't really a mistake. It may be the just fine.
If you have a working usb install media you generally need to move it up in bios order to a hard drive order choice. Not a usb choice. Some boot time F key menus can select it.
Does usb show up in hard drive bios order menu?
As to F12, you may have to press it a number of times early, some other key like F9 or try external keyboard even. Exact make and model may help us.
Last edited by jefro; 09-23-2016 at 02:53 PM.
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