It could be all of them…how old is your computer?? know the name of the motherboard or tower? What OS do you have??
In short, here are the requirements for the Phonak iPFG, for example:
https://www.phonakpro.com/com/b2b/en/professional_tools/fitting_equipment/software/system_requirements.html
If you can’t satisfy the minimum requirements, the USB being 1.1 or 2.0 will be moot. The older machines made back in the early 2000’s will be more than likely make the minimum processing speed, and the requirement of the USB did not specify version, but it won’t hurt to have 2.0.
Even RAM is important, minimum to run iPFG is 512 MB of RAM, plus what you need to run the machine…