gael33,
Regardless of the operating system it is possible to set up a wireless access point using an old router.
The two routers are connected either by an ethernet cable or by powerline networks.
I would recommend using an ethernet cable first, just to make sure everything works okay before using network adapters.
I hope this article gives you a better idea of what is required:
http://www.tested.com/tech/298-how-t...wi-fi-network/
NB Log in to your new router and write down all relevant details including SSID, WPA2 settings, encryption type and passphrase etc.
By the way, you may find this Wifi Analyser App useful:
https://play.google.com/store/apps/d...lyzer&hl=en_GB