Sylvania synet07526

I have Sylvania synet07526.I bought it from my friend who has been using it for last 1 year.Now i’m nt able to access internet in this netbook.Wifi and datacards are not working well.I can see all wifi access point but not able to connect with them.Please suggest what should i do? should i update it’s drivers n give me a link from where i can get these updates…