1. Download the Android SDK onto your disk or local drive.2. The rest of the SDK components will not be installed using the SDK Manager, simply point your browser to: http://dl-ssl.google.com/android/repository/ . Quickly find the android platform that you want to download by pressing Ctrl+F ( In FireFox), we want to find the latest Android platform 2.2 so we typed in: 2.2
Other available platforms: 2.1, 1.6 and 1.5 . Highlight the part: android-2.2_r02-windows/linux/macosx.zip and copy it to the end of the url above. Download the zipped document, unzip the contents to the "Platforms" folder in your Android SDK directory. This step will allow you to set the build target for your android applications.
3. Follow the rest of the instructions i.e steps 1,2 and 3 on http://developer.android.com/sdk/index.html . The above instructions cater for step 4 on http://developer.android.com/sdk/index.html .
4. All the best !