Browswer only works with IP Address

Hello,
I am using Acer Extensa. I tried to connect with Ethernet cable at home and today wirelessly to my work network and it works ok. The only problem is that my IE browser doesn't work at all. It only display the yahoo.com website when I type an IP address. I've checked already settings, in command prompt did ping and check ipconfig and dont have a clue what can solve my mysterious problem.