Windows 7 - Network Adapter is disabling automatcual

This sometimes happens.
Sometimes when I turn on computer or when I exit the game my internet connection is not working.And I find one more network (undefined public network).Then I must disable that network and run troubleshooting problems then it detects network adapter is disabled.Why is this happening,and how you I resolve it to never happen again?
I have Windows 7 Ultimate 64bit SP1 RC and my modem is HG520s.

Is it possible for you to upload a screenshot of your network connections...

But this is fixed.
And on taskbar that small ican for internet connectio I have broadband connection I am not using it and I don't know what is for.

Now can you upload a picture of your network connections.

So... on the screen you just uploaded click 'change adapter settings' and post a screenshot of that window.

Also if possible post a screenshot of your ipconfig/all

Thankyou

This will be an issue with your PPPoE establishing a connection when you access the internet.

Are there any other people using your internet connection?
basically how is your network setup?

If not have you tried to disable this connection and re-create the problem...or delete this network connection altogether...

Yes one friend is using my internet via wireless.
Only when I give him to use.But when he connect and he didn't tell me I trun off wireless
btw I deleted boardband connection

How did you get on after deleting this network connection...

Check out wikipedia for more info on PPPoE, but basically its your ISP encapsulating PPP frames into ethernet frames, It basically monitors who is using the DSL modem, routers usually have built in support for PPPoE.

Do you or your friend have to log in everytime you access the internet?

No.Just click on a browser and surf .
But now its ok I don't have anymore problems.
I will give you rep