Good evening novie42 and welcome to CH
First off Who's hot spot is it yours like a mifi or like a coffee shop hotspot?
Do you have a wireless connection at your home if so does it work? or are you using the hotspot / mifi at your house?
Did you by mistake shut off your wireless connection?
These other PC's are yours at your house? or friends PC, please try to be just as descriptive as possible.
Hope to hear from you soon, Mike