Thank you for posting Thiago.
If the only thing that changed is the operating system we suggest checking if your router’s firmware is up to date. Otherwise you may want to contact the computer manufacturer for further assistance.
Thank you for the repply. I actually connecting my new HP by cable to an old Acer, to use the Acer wireless to have internet. It always work in this case.
Also if the driver it works on my computer in a day, it works well until next reboot. Because that, Seens to me its not a router issue.
I still thinking is the driver that doenst work well on windows 8. At list in my windows 8.
thanks and best regards.