I was much exited to use Google's Android 
Studio. As prerequisite I install necessary JDK and JRE. But 
after installation, I am facing some problem. When I click on icon, nothing 
happen on screen. When I start "Task Manager", I saw there are numbers of 
"cmd.exe" files are running.
To solve this problem, 
- Go to the Environment Variables ( Control 
	Panel -> System -> Advanced System Settings  -> Advanced (tab) -> 
	Environment Variables).
- Add JDK_HOME with the correct path 
	under System Variable.
Example
variable -> JDK_HOME
value -> c:\program files\java\jdk1.7.0.xx
Note - path may be differ in your case, check 
before adding
If still not working, add another variable 
named "JAVA_HOME" and same value like above.