How to reset Android Studio

I only know how to do this on Windows (but it should be similar on any OS, you will just need to find the correct location yourself - google search would help with that).

On Windows:

Go to your User Folder - on Windows 7/8 this would be:

[SYSDRIVE]:\Users\[your username] (ex. C:\Users\JohnDoe\)

In this folder there should be a folder called .AndroidStudioBeta or .AndroidStudio (notice the period at the start - so on some OSes it would be hidden).

Update

Now, Android Studio settings is at:

C:\Users\<Your User>\AppData\Roaming\Google\.AndroidStudio4.X

Delete this folder (or better yet, move it to a backup location - so you can return it if something goes wrong).

This should reset your Android Studio settings to default.

On Mac OS X

Remove these directories:

~/Library/Application Support/AndroidStudioBeta  
~/Library/Caches/AndroidStudioBeta
~/Library/Logs/AndroidStudioBeta  
~/Library/Preferences/AndroidStudioBeta

For MaxOSX:

rm -rfv ~/Library/Application\ Support/AndroidStudio*
rm -rfv ~/Library/Preferences/AndroidStudio*
rm -rfv ~/Library/Caches/AndroidStudio*
rm -rfv ~/Library/Logs/AndroidStudio*
rm -rfv ~/.AndroidStudio*

For Android Studio 1.2.2 version, config path is ~/Library/Application\ Support/AndroidStudio1.2/ and ~/Library/Preferences/AndroidStudio1.2, so it's better to rm matching prefix.