NETWORK ADAPTER

my sister’s laptop is ACER ASPIRE 3690 , now it can’t be used with to internet because it’s broadcom network adapter are missed or corrupted (code39) as written in the troubleshoot box.. and now, i tried different drivers but all of them didn’t work .. can u suggest a link or name of drivers that i can install so that we can use the internet?.. then also instruct me what to do then? thank u so much !