I ran into a couple problems having android studio to install and work. thought I'd share my findings!
First, it wouldn't install. Not finding Java JDK even though it was installed.
This is solved by changing the name of C:\Windows\System32\Java.exe to something else before the installation.
Don't forget to change it back to java.exe once installed.
After installing Android studio, it wouldn't run (normal or admin didn't change a thing).
You will need to create a system environment variable named JDK_HOME with your JDK installation path (in my case C:\Program Files\Java\jdk1.7.0_21\ ).
Android studio should now launch. (more help here )
Now that Android Studio launches, it asks for the latest android SDK
Just download and install the SDK 22 from Here
make sure you run the .exe as administrator after installation
For those having issues starting Android Studio in some Linux distros, such as Studio not finding JAVA_HOME, JDK_HOME, STUDIO_JDK, set any of those variables to the directory where Java is installed (e.g. /usr/java/jdk1.7.0_21) previously to the whole validation statements in the startup shell file (studio.sh) and everything should be fine...