I upgraded my windows and reinstalled Android studio 0.3.2. I am using windows8.1 Pro now and installed java x64, I also did set up JAVA_HOME
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Try the following: Open a new commandline (Win+R => cmd.exe) and enter "java". I predict that you'll get an error that says something like "command not found". The reason for this is that you don't have an windows environment variable set for your java.exe.
Do so by Win+X => System => Advanced System Settings => Advanced => Environment variables => search for PATH under the system variables => edit => append the path to your java.exe sperarated by ;
For example: ../other/pathes/with/file.exe;C:\Program Files (x86)\Java\jdk1.6.0_45\bin
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