Re: "boot error" message on boot from usb created with "USB startup disk Creator "
Check CMOS (BIOS) settings for USB. I think you may need Auto or Legacy for USB. Anyway try a different setting and see if that works. Some will say in BIOS help that you need a specific USB setting to boot from USB.
I have generally found that on Dell computers you still have to press F12 during BIOS splash to select USB even if you earlier set USB before hard drive in boot order. On those computers the only time it "might" work without pressing F12 is if that USB device has always been connected and booted from since you set BIOS boot order.
i5 650 3.2 GHz upgraded to i7 870, 16 GB 1333 RAM, nvidia GTX 1060, 32" 1080p & assorted older computers