On Windows 7 64-bit, running Eclipse 3.6 64-bit, JDK (jdk1.6.0_23) 64-bit and Android 2.3 (bitness?), running a program via Eclipse\'s Run|Run (Ctrl+F11) invokes the android
I had the same problem as the original poster and I'm also using Android SDK 2.3, Eclipse Helios, JDK 1.6.0_23 64-bit on Windows 7 Professional 64-bit.
However, once I've killed the adb.exe *32 process and then restarted eclipse and then tried running HelloAndroid app again, the emulator started successfully, the app *.apk was loaded and ran perfectly.
I didn't do anything else and I haven't installed JDK 32-bit on my machine.