Windows 7 internet problems

I have a Everexx stepnote va4104m I installed windows 7 and after that it says i have an internet connection, but when I open a web page sometimes it load sometimes it does not it says that the link appears to be broken and that it's a dns error. Can someone help me fi this? thank you

This website is not affiliated, owned, or endorsed by Microsoft Corporation. It is a member of the Microsoft Partner Program.