I am trying to build an Android development environment on my PC. But I'm encountering some problems, and desperately need help.
Operating System: **Windows 7 (64 bit)**  

Installed components:

* Android SDK (installer\_r12-windows)
* Eclipse Classic 3.7 for Windows 64 bit

I am trying to install the ADT Plugin for Eclipse but I'm having some trouble with it.
I tried following the instructions listed on the official site (http://developer.android.com/sdk/eclipse-adt.html) but without success.
I first tried setting the location for the new repository to 

<https://dl-ssl.google.com/android/eclipse/>

as suggested, but I got the following error message:

> 
> Unable to connect to repository
>  <https://dl-ssl.google.com/android/eclipse/content.xml>
> 
> 
> 

(I tried using "http" instead of "https" but got the same results).

I then tried as suggested to download the ADT Plugin zip file, and set the location of the new repository to the local copy I downloaded. But, this time I couldn't go through with the installation because 'Android DDMS' caused the following problem:

> 
> Cannot complete the install because one or more required items could
>  not be found. Software being installed: Android Development Tools
>  12.0.0.v201106281929-138431 (com.android.ide.eclipse.adt.feature.group
>  12.0.0.v201106281929-138431)
> 
> 
> 

Can someone help?