I am using Windows 7 and JDK 6.
I downloaded the package of Android SDK with Eclipse and followed the instructions to create the first Hello World application.
H
I did some thing very simple.. I copied the adb.exe from users folder (users//android-sdks/platform-tools to tools folder under android-sdks.
Then in preferences under Android i clicked "restore Defaults" then again browsed back to C:\Users\\android-sdks then clicked on the latest API (19) clicked ok..
then it worked!!