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Victor Warner1,882 Points
'tools.jar' seems to be not in Android Studio classpath. Please ensure JAVA_HOME points to JDK rather than JRE.
i had changed the envirnomental settings in properties to b/java/jdk something but it still does not register when i open up adnroid studios need help asap
J.D. Sandifer18,813 Points
I had a similar problem when I set up Android Studio. What fixed it for me was adding a "\" to the end of the JAVA_HOME variable. E.g. C:\SomeFolder\Java\jdk1.8.0_42\ instead of just C:\SomeFolder\Java\jdk1.8.0_42.
Try that and see if it works for you.