My Network security says : no authentication \ Encryption type : None?

What does that mean?

It's a temporary router till the previous one get fixed but I'm worried about what does this one mean?

also , I've tried all types of options but it always says : the Network requirements don't match with the security type of this comp : the network is unsecured while my comp is set to secured (that's the way I understood .. hope it's correct)

so, I'm not worried much about someone might use the wireless connection , what I'm worried about is : will anybody have access to my comp?

I've turned off everything in the sharing center

please explain this in the easiest form you might come up with .. thank you !