This post will help you to setup the android 1.1 and 1.5 emulator.
You must have java installed on your machine before installing the Android emulator.
Install Java from here: Go to http://www.java.com/getjava/index.jsp and install to java.
If you already installed java or recently then you must know that the version of Java installed on your machine is correct or not.
Test installed java from here: Go to http://www.java.com/en/download/installed.jsp to check whether you have correct version of java installed or not. If you fine that correct version is not installed then follow the instruction provided in page and install the correct version of java.
After completion of java installation successfully follow below steps to install the Android emulator.
Where to download the android emulator ?
Android emulator comes with Android sdk.You can download latest sdk from:http://developer.android.com
How to install android emulator ?
Downloaded android sdk will be in compressed format.Uncompressed it to the desired location [e.g. C:\Emulator]and you are done.