With that case you don't need to use a USB flash drive since you can take the side cover off and use a disk drive for the initial Windows install then remove it when you don't need it, or use a USB external disk drive (usually around $35).
Just buy a legit version of Windows, then you won't need to worry about pre-installed viruses, malware or the inability to update your system. Also you will be able to upgrade to Windows 10 without issues.