Issue installing Android development kit

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Java

Mobile

Android

SDK

Hi,

I have few question regardig android development kit.
I have downloaded the android developemtn kit from android site(google).I have installed the appropriate java (jdk) too.
When the installation was completed and the android development kit (ide) started :

1) First it asked for the proxy setting.The system where i installed the adk has no internet connection.Is is compulsory that the environment should have environment ?

2) Then i installed it in the system with internet access, after installation is started downloading the sdk.I wonder the skd is available in user/appdata then why is it downloading?
Shouldn't it take the sdk from the hard drive?

3) I went through several site for installing adk but no one dealed with the problem.Can any one help he to get rid of it.

I am having problme installing adk even after i have all the required components.
Is there someone giving detail on installing adk in windows?