android studio sdk manager not working

installed android studio, following demo how to on youtube, came across problem where sdk manager button says it is starting but it never comes back

I have the original line:

set java_exe=
 call lib\find_java.bat

in my android.bat file when I run it manually from command line I get the following:

E:\Program Files (x86)\Android\android-studio\sdk\tools>android.bat
Exception in thread "main" java.lang.NoClassDefFoundError: org/eclipse/swt/widge
ts/Display
        at com.android.sdkmanager.Main.showSdkManagerWindow(Main.java:402)
        at com.android.sdkmanager.Main.doAction(Main.java:390)
        at com.android.sdkmanager.Main.run(Main.java:150)
        at com.android.sdkmanager.Main.main(Main.java:116)
Caused by: java.lang.ClassNotFoundException: org.eclipse.swt.widgets.Display
        at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
        ... 4 more



confused as to why this is happening as well as what is relationship to sdk manager and android studio? are they two separate products? etc? thanks