Problem with network connection

[mahar116]

Hello:
I have installed win7 ultimate 32 bit in dell optiplex780 .From yesterday i have a problem with my network connection.When i start my pc i got yellow sign on my network connection sign i try window troubleshooting but it find no error.After little time internet runs again but yellow sign remain there.I uninstall the network driver and install it again and i change the network cable with new cable but problem still there.plz help me to solve this problem.pic is attached under.

[mahar116]

I solved my problem by seeing the video on youtube i use second option my problem solved.

link is under

https://www.youtube.com/watch?v=axVK8skvwtY

Thanks for your help guys