Windows 7 hotspot authentication problem

[grind]

Hello again guys,
 
I used to use a usb wifi antenna to connect my pc to the internet, because it's far from the modem. But recently I passed a cable trough the wall and I thought of using the wifi antenna to create a hotspot, since the wi-fi signal on my room is so bad. So I followed this tutorial and set it up. the connection appears in the connection central of windows, and I can see it from my phone.

 

So, my phone has full signal, but when I try to connect, the signal drops to 1 bar and after some time it shows the message "Autenthication problem".

 

I don't know what to do, I tried looking for solutions but found nothing that would help me. Anyone knows how to fix this?

 

If you want i can provide prints, but my system is in portuguese, it may not help at all (well, I can translate if needed)