Internet on Acer laptop doesn't work

Hello,so.... a few days ago i bought an acer aspire 5,and i had a few problem with it until i found the right drivers for it and i installed the wifi drivers and then i started having problems and the biggest problem started today, like a hour ago
internet was working fine until i went to have lunch and then after i came back to the laptop, i was connected to the wifi but it didn't work at all on the laptop,other devices work like like the pc and my dad's laptop,so can anyone help me and ive also read a lot of threads and posts but none helped me
Thanks in advance