how to reinstall for new network setting system in ubuntu 11.10

At the booting time ,it tries to detect all the available networks which is taking long time.
Therefore, to save time, suggest me how can i remove my previous network setting and can have a fresh settings.
Thanks.

Hi ,
please open a terminal and give below command

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gksudo nm-connection-editor
==========================

at the opened window you can edit your connections with root privileges.

Thanks

Thanks, But that's not my problem of connection setting. I did manual setting after following the steps for ADSL modem configuration
As
http://calcuttatelephones.com/dataoneinstall/mu09.html
There after
 my boot time has gone up to 2-3ms and my shut down time to over 11s! A slight increase is fine, but this is quite alarming.

Hi ,
I am not sure I understood correctly your problem.
Try this command

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sudo apt-get remove --purge modemmanager
=====================================

and see if fix your problem. Above command will UNINSTALL and purge all configuration files of modem-manager.

If your problem not solved , or different problems occur , you can install again modem manager with below command
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sudo apt-get install modemmanager
==============================

Thanks