Weird that drivers didn't get installed if a factory reset was carried out. Every factory reset I've ever done over the last 20 years included the drivers.
All drivers are free if you get them from the right place - - in your case Acer's website.
I don't think a phone will cut it though -- you'll need to use another PC or laptop with a pen-drive plugged in to it to save the drivers on. Then plug pen-drive in to your Acer to install them. Good luck.
it could work if your pc detects and installs the phone, then you can explore it and find it where it downloaded. but the problem is that windows will not probably install it cause its missing drivers to do so like Philip said other PC and a USB drive