Am I safe if I am not using Windows 8?
Also, I built the computer myself, it was not a computer pre-built with Windows 8.
The last I heard, WUBI was not compatible with EFI-mode booting. Thus, if your Windows is installed in EFI mode, you should not attempt a WUBI install, since it will be a waste of time at best.
That said, just because a motherboard supports EFI doesn't mean that it's necessarily booting using EFI. If you install Windows in BIOS/CSM/legacy mode, you should be able to use WUBI. You can check your Windows boot mode by examining the partition table: If it uses the older Master Boot Record (MBR) system, Windows is installed in BIOS mode; if it uses the newer GUID Partition Table (GPT) system, Windows is installed in EFI mode.
You can install Linux side-by-side with Windows in a traditional non-WUBI way in either BIOS or EFI mode, so as a general rule, that's the safest way to proceed. If you're building the computer from scratch, that's likely to be the better way to go; WUBI is best used if you're not certain you want to keep Linux and if you don't want to bother repartitioning. You should learn about BIOS vs. EFI boot modes in Linux to ensure you install Linux in a compatible way. One quick check is to open a Terminal or switch to a text-mode console and look for the directory