How can I connect to the internet? Problems involving the network and sharing Center does not.

Hello.
I live in a House and bought a range extender so that I can get a connection in my basement as well.  I have installation range Extenders without problem.  When you install the range extender, I changed my name to my network router.  I changed the name of the network by typing 192.168.1.1 in my browser.
The MacBook connects without a problem.  In the basement, the connection of Windows 7 works very well.  I have just connected Vaio Windows 7 my mother to the network, but it prompted that I enter the user credentials.  I read a post above and got that problem solved by opening the network and sharing Center and adding a new connection.  Now that the connection is configured correctly.
The problem is with the laptop HP Windows Vista family basis.  Since I install the range extender, I can't connect to the network.  He had no problems before you connect the router or other networks to visit other places.  The new network name appears, but when I click it, it says I have to enter the user credentials.  I tried to manually, but the name is taken so I can't make a new and invites me to connect to the network that is established or to connect to a different network.
  • I tried to open the network and sharing Center, but it does not open.  When I click it, it opens a screen for a brief second.  The option "Display the status of network and tasks" opens either.
  • I logged as an Administration by entering the command line < net="" user="" administrator="" ctive:yes=""> > and restarted the laptop.  Even logged in as administrator, this folder does not open.
  • I also did a scan < sfc="" cannow=""> >.  The digitized rolled up with an error, but the error has been corrected.
  • I also updated the connection of the range extender.
Why the network and sharing Center will not be open to the top?
How can I configure my router my HP Windows Vista Linksys connection?
Thank you.  Please let me know if you need more information.

Thanks for your reply.

In a last attempt, my sister has used the ethernet cable to connect directly to our router.  Next time, she turned on her laptop, she managed to connect to our wireless network and she was not invited to enter credentials.
In this case, the manual connection helped solved the problem.

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