Default [Q] Hot spot wifi - Windovs Vista

Hello to all,
I decided to write here hoping to find a solution to an issue which is making me crazy.

On a pc of a friend of mine, I try to surf internet using my Nexus 4 as hot spot wi-fi.
The pc is setted with Windows Vista.

The pc can see without any problem my N4, the wifi connection is excellent, but it is impossible to surf on internet, windows say "Local Network" (with the grey earth) or few errors like "Server DNS 8.8.8.8 not available (or somethig similar).

I try also with the Samsung of the friend of mine (a Samsung Galaxy Young) without any improvements.
I try with my iPad 4 LTE and, incredible, the internet connection has been possible.

Anyone can give me an advice to solve this crazy problem?

Thank you very much

Ivan